- Study protocol
- Open Access
Vitamin D supplementation to prevent depression and poor physical function in older adults: Study protocol of the D-Vitaal study, a randomized placebo-controlled clinical trial
BMC Geriatrics volume 15, Article number: 151 (2015)
Depressive symptoms and decreased physical functioning are interrelated conditions and common in older persons, causing significant individual and societal burden. Evidence suggests that vitamin D supplementation may be beneficial for both mental and physical functioning. However, previous randomized controlled trials have yielded inconsistent results and often had suboptimal designs. This study examines the effect of vitamin D supplementation on both depressive symptoms and physical functioning in a high-risk population of older persons with low vitamin D status.
The D-Vitaal study is a randomized, double-blind, placebo-controlled trial investigating the effects of a daily dose of 1200 IU vitamin D3 versus placebo for one year on depressive symptoms and physical functioning (primary outcomes) in older adults. Participants (N = 155, age 60–80 years) were recruited from the general population. Eligibility criteria included the presence of depressive symptoms, ≥1 functional limitation and serum 25-hydroxyvitamin D levels between 15 and 50/70 nmol/L (depending on season). Secondary outcomes include incidence of major depressive disorder, anxiety symptoms, health-related quality of life, cognitive function and cost-effectiveness of the intervention.
With this study, we aim to elucidate the effects of vitamin D supplementation on depressive symptoms and physical functioning in older persons who are at high risk of developing more substantial mental and physical problems. If effective, vitamin D supplementation can be a preventive intervention strategy that is easy to implement in the primary care setting.
Netherlands Trial Register NTR3845. Registered 6 February 2013.
Depressive symptoms are common in older adults, occurring in 8-16 % of persons over 55 years of age . These symptoms are associated with various adverse health outcomes, such as a higher risk of cardiovascular diseases , hospitalization and mortality  and reduced quality of life . Treatment of depression in older persons is often suboptimal, for example due to societal stigma, side-effects of anti-depressant medication, or interactions of antidepressants with other medications [2, 4]. Hence, development of a simple and safe prevention strategy is pivotal.
Ageing is also commonly accompanied by a decline of physical functioning. Studies show that functional limitations and poor physical performance are highly interrelated with depressive symptoms, both cross-sectionally and longitudinally [2, 5–9], which can easily result in a downward spiral.
Previous research suggests that vitamin D supplementation may improve both mental and physical health, although evidence is inconsistent [10–12]. Vitamin D inadequacy - defined as serum 25-hydroxyvitamin D (25(OH)D) levels of <50 nmol/L  - occurs in about 50 % of elderly persons from Western countries . Vitamin D is synthesized in the skin under the influence of sunlight. In addition, some vitamin D is retrieved from food, especially from fatty fish . Causes of vitamin D deficiency in older persons include declining efficiency of the skin to synthesize vitamin D, a lower amount of sun exposure and reduced nutritional intake .
Several biological mechanisms that can explain the relationship of vitamin D deficiency with depressive symptoms and poor physical functioning have been suggested (see also Fig. 1). The active metabolite of vitamin D - 1,25 dihydroxyvitamin D (1,25(OH)2D) - is synthesized in the brain by the enzyme 1α-hydroxylase , enabling local activation of vitamin D. Moreover, the vitamin D receptor (VDR) is present in several brain areas important for depression and emotional behaviour, including the hippocampus and hypothalamus . Furthermore, 1,25(OH)2D promotes the synthesis of depression-related monoamine neurotransmitters such as serotonin [17, 19, 20] and has a general protective effect on brain functioning through immunomodulation, anti-inflammatory action and promotion of neuroplasticity [17, 19, 21]. Regarding physical functioning, the VDR has been observed in the cerebellum , which is an important brain area for mobility, gait and balance . In addition, the presence of 1,25(OH)2D and the VDR in muscle tissue facilitates muscle contraction speed, muscle power and cell growth .
Prospective cohort studies suggest that vitamin D deficiency is associated with depressive symptoms, poor physical performance and functional limitations [23–26]. In the InChianti study, vitamin D deficiency at baseline almost doubled the risk of depressive symptoms after three and six years and was also associated with lower physical performance .
Evidence from randomized controlled trials (RCTs) is diffuse and inconclusive. Tables 1 and 2 provide an overview of previous RCTs examining the effects of vitamin D supplementation on depressive symptoms and physical functioning. Only RCTs that included adults and had a sample size of ≥40 were selected (search strategy available from the author). From these tables, it can be concluded that previous RCTs have been heterogeneous with respect to sample size, age range of the participants, dosage of the supplementation, duration of the intervention and outcome measures. Moreover, only a very limited amount of studies included high-risk participants, i.e. persons with low serum 25(OH)D and mental/physical symptoms at baseline. It can be expected that supplementation is more effective and relevant in persons with low baseline 25(OH)D levels and in persons with clinically relevant depressive symptoms or reduced physical functioning.
Four out of nine RCTs on depression (44 %) observed a significant positive effect of vitamin D supplementation on depressive symptoms (see Table 1). However, only two studies included persons with either low 25(OH)D or depression at baseline [28, 29], and only one study included persons with both characteristics . The latter study and the study that included persons with a diagnosis of major depressive disorder (MDD)  observed significant improvements after the supplementation.
Table 2 shows that in 14 out of 28 RCTs (50 %), vitamin D supplementation improved physical functioning. Twelve studies included participants with either low 25(OH)D or poor physical function at baseline, and physical function improved in seven (58 %) of these studies. Only one study included persons with both low 25(OH)D and poor physical function  and this trial observed a significant improvement of physical performance.
In conclusion, the effect of vitamin D supplementation seems more pronounced in persons with low 25(OH)D levels, depressive symptoms and poor physical function at baseline. However, RCTs that specifically included participants with these characteristics are scarce. Furthermore, to the best of our knowledge, no studies have examined the effect of vitamin D supplementation on the combination of mental and physical functioning, despite the fact that these are interrelated concepts.
The current RCT aims to fill this knowledge gap by investigating whether older adults at high risk for poor mental and physical health can benefit from supplementation with vitamin D. Primarily, the D-Vitaal trial examines whether vitamin D supplementation improves depressive symptoms, functional limitations and physical performance in persons with low 25(OH)D levels, clinically relevant depressive symptoms and functional limitations. Other, secondary health outcomes are assessed as well, such as incident MDD , anxiety , health-related quality of life [34, 35] and cognitive functioning . In addition, it will be investigated whether vitamin D supplementation is a cost-effective strategy for the above-mentioned aims. If proven effective, vitamin D supplementation can easily be implemented in the primary care setting as a simple and safe strategy to prevent both mental and physical disorders in the elderly population.
Design of the study
The D-Vitaal study is a randomized, double-blind, placebo-controlled clinical trial that is carried out in the Netherlands. This study examines the effect of a daily dose of 1200 IU vitamin D3 versus placebo on depressive symptoms, functional limitations and physical performance. We included 155 participants aged 60–80 years. The duration of the intervention is one year. The D-Vitaal trial was approved by the Medical Ethics Committee of the VU University Medical Centre Amsterdam and is registered with the Netherlands Trial Register under NTR3845. The D-Vitaal study adheres to the CONSORT guidelines for randomized controlled trials.
Potential participants were screened for presence of clinically relevant depressive symptoms, functional limitations and low serum 25(OH)D levels (≤50 or ≤70 nmol/L in winter (October-March) and summer (April-September), respectively). In this way, we recruited a vulnerable population at high risk of subsequent mental and physical function decline. As severe 25(OH)D deficiency can be associated with bone disease , persons with 25(OH)D levels of <15 nmol/L were excluded and referred to their GP for treatment. In addition, persons with a current MDD diagnosis were excluded, as the aim of this study is to prevent depression. Furthermore, persons who use antidepressant medication were excluded at screening because of possible interference of antidepressants with the effect of vitamin D on depressive symptoms. Persons with sufficient concentrations of 25(OH)D (>50 or >70 nmol/L in winter and summer, respectively) were also excluded, as it was expected that the effect of supplementation in these persons would be negligible. The summer/winter cut-off difference of 20 nmol/L was based on the observation by Van Schoor et al. that the seasonal variation of vitamin D levels in two cohorts of Dutch older persons was 14–24 nmol/L . The Health Council of the Netherlands advises a supplement of 800 IU/day vitamin D for institutionalized persons . Therefore, only community dwelling persons were included in the trial. Table 3 lists the inclusion and exclusion criteria of the D-Vitaal study. All participants provided written informed consent prior to the start of the intervention.
Recruitment and setting
The D-Vitaal study is carried out in Amsterdam and surrounding municipalities in the Netherlands. Both urban and rural areas were included. The majority of the participants was recruited through municipality registries. Municipalities in the surroundings of Amsterdam provided the addresses of inhabitants in the age range of 60–80 years. These persons received an information brochure about the study by mail. In addition, advertisement posters and information leaflets were distributed in community centres. About 20 % of participants was recruited through general practitioners (GPs) in Amsterdam. Using a standardized search in their electronic medical records, the GPs selected eligible patients between 60–80 years. These patients received a letter from their GP to draw their attention to the study. Finally, excluded participants of a previous clinical trial  who had indicated to be interested in contributing to future research, were invited to participate in the D-Vitaal study. Recruitment commenced in June 2013 and the inclusion was finalized in April 2015. Figure 2 shows a flow chart of the recruitment, selection and randomization in the D-Vitaal study.
The screening phase of the D-Vitaal study included two steps: a mailed questionnaire and a short interview including a blood sample. The screening questionnaire assessed presence of depressive symptoms (Centre of Epidemiological Studies - Depression scale (CES-D) score of ≥16 ) and functional limitations and was also used to exclude persons who use antidepressant medication, vitamin D >400 IU/day and/or calcium supplements >1000 mg/day. For the first 12 participants, we used only the Functional Limitations questionnaire of the Longitudinal Aging Study Amsterdam (LASA-FL)  for the assessment of functional limitations. A LASA-FL score of ≥1 indicates the presence of functional limitations. However, this instrument proved not sensitive enough for this study population, creating a large ceiling effect. Especially younger-old participants (e.g. persons in their early sixties) reported few or no problems on this scale, as their level of general functioning was still moderate to high. Therefore, we added the Physical Functioning subscale of the Short Form-36 Health Survey  (SF-36-PF) to the screening phase. The SF-36-PF contains 10 items on physical functioning and assesses a broader range of functional limitations. Having difficulty with at least one of the items of the SF-36-PF was regarded as presence of functional limitations. Persons who were eligible according to the screening questionnaire (presence of both depressive symptoms and functional limitations) were invited for a screening visit where presence of MDD was examined and a blood sample was drawn to determine serum 25(OH)D levels.
Intervention and randomisation
Participants were randomly allocated with a 1:1 ratio to one of two treatment groups: vitamin D3 (cholecalciferol) 1200 IU/day or placebo. Participants were stratified by sex and women were stratified by age (60–70 years/71–80 years). An independent pharmacist prepared three randomisation lists with computer-generated numbers using block sizes of four.
The intervention group takes three tablets of 400 IU vitamin D3 daily for a duration of 12 months. Based on earlier research, the daily dose of 1200 IU will lead to stable mean 25(OH)D levels of >80 nmol/L in the intervention group, with 90 % of individual 25(OH)D levels above 60 nmol/L within a few months [44, 45]. The placebo group receives identical tablets without vitamin D and it is expected that this group maintains a mean serum 25(OH)D level of about 45 nmol/L. Both the vitamin D and placebo tablets were purchased from Vemedia Manufacturing B.V., The Netherlands. The tablets are supplied in vials of 100 tablets for 6 months, 600 tablets at a time. Participants are allowed to take a (multi)vitamin D supplement with a maximum of 400 IU/day in addition to the study tablets.
Calcium positively influences the bioavailability of vitamin D . In addition, some effects of vitamin D may be caused by increased calcium absorption. Therefore, all participants were advised to use at least three dairy consumptions daily to ensure adequate calcium intake of about 1000 mg/day. Calcium intake was assessed with a structured questionnaire during the screening phase. If calcium intake was low (less than 2 dairy consumptions per day), calcium tablets of 500 mg/day were prescribed to these participants.
Face-to-face interviews take place at screening, baseline, six and 12 months. The baseline visit was timed closely after the screening phase. Shortly prior to the interviews, participants are asked to complete a mailed questionnaire to reduce interview time. Short telephone interviews are conducted after two weeks, three and nine months to check compliance and adverse events. Table 4 lists all measurements and their time points of the D-Vitaal study. Interviews and blood sampling are carried out by trained researchers or research nurses and take place at the participant’s home, at the VU University Medical Center, or at local community medical centres. The Endocrine Laboratory of the VU University Medical Center conducts the 25(OH)D determinations. Participants who discontinue taking the study tablets for any reason are asked to participate in the remaining follow-up measurements. Any (serious) adverse events are carefully monitored.
Compliance is checked by tablet count. To stimulate compliance, participants are contacted by telephone (after two weeks, three and nine months) and reminded at follow-up visits. The ultimate compliance check is the measurement of serum 25(OH)D after 6 months.
The CES-D  is used to measure differences in mean change of depressive symptoms after 12 months between the two treatment groups. The CES-D contains 20 items with a score range of 0–60. Higher scores indicate more depressive symptoms. A score of ≥16 is indicative of clinically relevant depressive symptoms. The CES-D is a widely used instrument that displays good psychometric properties in various elderly populations .
The LASA-FL questionnaire  includes six items assessing common daily activities: climbing stairs, cutting toenails, walking 5 minutes outdoors without resting, rising from a chair, dressing/undressing oneself and using own or public transport. Participants indicate whether they are able to perform these activities without difficulty, with some difficulty, with much difficulty, only with help, or not at all. The instrument can be scored in two ways: by determining the amount of functional limitations (score range 0–6, with higher scores indicating presence of more functional limitations) and the degree of functional limitations (score range 0–24, with higher scores indicating more severe functional limitations). The LASA-FL is used to measure differences in mean change of the amount and degree of functional limitations after 12 months between the two treatment groups.
A modified version of the Short Physical Performance Battery (SPPB) [26, 48] is used to determine differences in mean change of objective physical performance between the treatment groups after 12 months. The SPPB includes a walking test (walking 3 meters, turning 180° and walking 3 meters back as fast as possible), a chair stands test (standing up from a chair without using hands five times as fast as possible) and a balance test (standing with feet in tandem stand (i.e. standing with one foot in front of the other, with the heel of one foot touching the toes of the other foot) for up to 30 seconds). Participants can score 0–4 points for each test, adding up to a maximum of 12 points, with higher scores indicating better performance. Reliability and validity of the SPPB are good .
Incidence of MDD
The depression-section of the DSM IV-based Composite International Diagnostic Interview (CIDI, version 2.1)  is used to assess presence of MDD. At six and 12 months, the CIDI is administered if a participant scores ≥16 on the CES-D.
Cognitive function is assessed with indicators of information processing speed and executive functioning obtained from the Stroop-Colour Word Test .
Health-related quality of life
Health-related quality of life is measured with the EuroQol - 5 Dimensions (EQ-5D)  and the SF-36 . The EQ-5D is a utility instrument that enables the calculation of Quality Adjusted Life Years (QALY’s). The SF-36 Mental Component Summary score (MCS) and Physical Component Summary score (PCS) are used as a measure of mental and physical health-related quality of life, respectively . Both instruments are widely used and well-validated in older populations [43, 55].
Timed Up-and-Go test
With the Timed Up-And-Go Test (TUG), functional mobility is assessed by asking the participant to stand up from a standard chair, walk a 3 meter distance, turn, walk back to the chair and sit down again .
Hand grip strength
Hand grip strength is measured in kilograms with a strain-gauged dynamometer (Takei TKK 5401, Takei Scientific Instruments Co. Ltd., Japan). Participants are asked to apply maximum force on the device while in a standing position. Grip strength is measured twice for each hand, consecutively alternating between both hands. The hand grip strength score is derived by taking the mean of the highest score for each hand.
To evaluate whether vitamin D is a cost-effective intervention for the prevention of depression and poor physical function in older persons, an economic evaluation will be performed. Dutch costing guidelines will be used . All relevant costs will be measured and valued, including the costs of the vitamin D intervention. Health care utilization is measured with the Trimbos and iMTA questionnaire on Costs associated with Psychiatric illness (TiC-P) . Health care costs include costs of GP and psychiatric care, ambulatory and outpatient hospital care, physical therapists and home care. Costs of production loss are not included, as the majority of the participants does not have a paid job.
Several variables are measured during the trial to check for possible (chance-based) differences between the treatment groups. Height and weight are measured with a calibrated stadiometer and scale, respectively. Body mass index (BMI) is calculated by dividing weight (in kilograms) by height2 (in meters). Waist and calf circumference is assessed with a tape-measure. Blood pressure and pulse are assessed twice with a three-minute interval using the Omron M1 Plus device (Omron Healthcare Europe). The date of the baseline interview is used to measure seasonal variation of serum 25(OH)D levels . Structured questionnaires assess age, gender, education level, marital status, smoking behaviour, alcohol use, current medication and supplement use, use of corticosteroids in the past three months, chronic diseases, physical activity (walking, cycling, gardening, household activities and sports , vitamin D predictors (exposure to sunlight, skin pigmentation, consumption of fatty fish)  and use of counselling.
Blood sampling and assessment of serum 25(OH)D
Blood samples are obtained in the morning by a trained research nurse at screening and 6 months for measurement of serum 25(OH)D. Participants are in a fasted state with regard to dairy products. Serum 25(OH)D is determined using liquid chromatography followed by tandem mass spectrometry . At screening, 25(OH)D was determined immediately after blood sampling. The 25(OH)D determinations of the 6-month blood samples will be carried out at the end of the study, to ensure randomization concealment. Serum, EDTA plasma and whole blood samples are stored frozen (−80 ° C) until determination and for potential future biomarker and DNA research.
The primary outcomes of the D-Vitaal study are change in depressive symptoms (CES-D score) and change in physical functioning (functional limitations and physical performance) after 12 months. In an RCT with a comparable population (older persons from the community with depressive symptoms but no MDD), the mean CES-D score was 26 (SD: 5.1) . To detect a change of 0.5 SD (i.e. 2.5 points change of CES-D score), a total of 40 subjects per group is needed, assuming a power of 80 %, a two-sided alpha of .05 and an intraclass correlation coefficient (ICC) of .70 between baseline and follow-up measurements.
The SPPB score ranges from 0 to 12. A change of one point (SD: 1.5) is regarded as a meaningful change . Assuming the same power, alpha and ICC as the CES-D calculation, 22 participants per group are needed.
The LASA-FL questionnaire is scored in two ways: by determining the amount (score range 0–6) and the degree (score range 0–24) of functional limitations. A change of one point in the amount of functional limitations can be regarded as a meaningful change . The SD was set on 1.7, based on analyses in the Longitudinal Aging Study Amsterdam (LASA), a large prospective cohort study of older persons. Assuming again the same power, alpha and ICC as the previous calculations, at least 28 persons per group should be included. For the degree of functional limitations, no meaningful change data or RCTs could be identified in the literature. Based on analyses in LASA, a mean difference of 2 points can be expected, with an SD of 4.5. For this outcome, 48 persons per group are needed, using the same assumptions as indicated above. Considering an expected dropout of 25 % and uncertainty of the 25(OH)D assay, we aimed to include at least 70 participants per group, altogether at least 140 participants.
Baseline characteristics between treatment groups will be compared using Pearson Chi-square tests, independent-samples t-tests, one-way ANOVAs, or non-parametric tests. Persons who drop out will be compared to persons who complete the study. Skewed data will be transformed. Data will be analysed according to the intention-to-treat principle with longitudinal data analysis techniques (generalized estimating equation (GEE) analysis or mixed model analysis) using SPSS (SPSS Inc. Chicago, IL, USA). A double-sided p-value of .05 will be regarded as statistically significant. If needed, models will be adjusted for relevant confounding variables. To investigate the interrelatedness of depressive symptoms and physical functioning, these variables will be added to each other’s effect analysis in separate models. Effect modification will be investigated for age, gender and baseline serum 25(OH)D levels.
Per-protocol analyses will be performed as a secondary analysis with participants who were compliant with the study protocol (≥80 % tablet intake). As a compliance check, the improvement of vitamin D status - i.e. the number of participants with serum 25(OH)D levels over 50, 60 and 75 nmol/L - will also be analysed in secondary analyses. Finally, as a sensitivity analysis, it will be investigated whether change in serum 25(OH)D is associated with change in depressive symptoms, functional limitations and physical performance over time in the total study sample (irrespective of treatment group).
The economic evaluation will be performed from a societal perspective with a time horizon of 12 months. The analysis will be done according to the intention-to-treat principle. Missing cost and effect data will be imputed using multiple imputation according to the MICE algorithm . Bias-corrected and accelerated bootstrapping with 5000 replications will be used to calculate 95 % confidence intervals around the mean difference in total costs between the two groups. Incremental cost-effectiveness ratios (ICERs) will be calculated by dividing the difference in mean total costs by the difference in mean effects on the primary outcomes (depressive symptoms, functional limitations and physical performance) between the treatment groups. A cost-utility analysis will be performed estimating the incremental costs per QALY gained. Bootstrapping will be used to estimate the uncertainty surrounding the ICERs, which will be graphically presented on cost-effectiveness planes. Cost-effectiveness acceptability curves and net monetary benefits will also be calculated. Sensitivity analyses will be performed on the most important and uncertain cost parameters.
As depressive symptoms and poor physical functioning are prevalent among older persons and cause significant individual and societal burden , effective low-cost prevention strategies are urgently needed. The D-Vitaal study aims to examine whether vitamin D supplementation decreases depressive symptoms and functional limitations and improves physical performance in older adults. The majority of RCTs that examined vitamin D supplementation included participants with adequate serum 25(OH)D levels and good mental and physical health, which may explain the absence of effects of some previous clinical trials in the field .
The D-Vitaal trial is innovative in several ways: it includes persons who may benefit most from the supplementation: older persons with low serum 25(OH)D levels and at high risk for developing poor mental and physical health. Furthermore, the tight interrelationship between depressive symptoms and physical functioning is taken into account by targeting both concepts in one RCT. Physical functioning is measured comprehensively with both self-reported questionnaires and objective tests. Finally, MDD diagnosis is included as a secondary outcome measure. This enables us to explore the effect of the vitamin D supplementation on the development of MDD. To our knowledge, this outcome has not been investigated previously in an RCT .
It is more urgent to study the effects of vitamin D supplementation in persons with inadequate vitamin D levels than to examine whether there are any additional effects of supplementation above normal ranges . The amount of supplementation (1200 IU/ day) used in the D-Vitaal study is a moderate dose, but sufficient to correct for deficiency and obtain an adequate vitamin D status [44, 45].
If the results of the D-Vitaal trial indicate that vitamin D supplementation is effective in reducing depressive symptoms and improving physical functioning in older adults, vitamin D can be an efficient intervention that targets two prevalent adverse health conditions simultaneously. The economic evaluation will provide evidence on the cost-effectiveness of the intervention. As vitamin D supplementation is inexpensive and displays minimal side effects, opportunities for implementation in the primary care setting seem promising. The first results of the D-Vitaal study are expected in 2016.
1,25 dihydroxyvitamin D
25 hydroxyvitamin D
analysis of variance
Beck Anxiety Inventory
body mass index
Centre of Epidemiological Studies - Depression scale
Composite International Diagnostic Interview
Diagnostic and Statistical Manual of Mental Disorders
EuroQol Visual Analog Scale
generalized estimating equations
intraclass correlation coefficient
incremental cost-effectiveness ratios
Longitudinal Aging Study Amsterdam Functional Limitations questionnaire
Mental Component Summary (SF-36)
major depressive disorder
Physical Component Summary score (SF-36)
quality-adjusted life year
randomized controlled trial
Short Form-36 Health Survey
Short Physical Performance Battery
Trimbos and iMTA questionnaire on Costs associated with Psychiatric illness
- TUG test:
Timed Up-and-Go test
vitamin D receptor
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We are very grateful to all participants of the D-Vitaal study for their valued contributions. We would like to thank all general practitioners and municipalities that helped us with the recruitment of participants. Furthermore, we thank our research assistants Ans Nicolaas and Nicolette Pliester for their dedicated work and all students and colleagues involved in the D-Vitaal study for their most-appreciated assistance.
The D-Vitaal study is funded by The Netherlands Organization for Health Research and Development (ZonMw), the Hague, the Netherlands (grant number 200210022). ZonMw had no role in the design of the study, the collection, analysis and interpretation of the data, or in the preparation, review, or approval of the manuscript.
The authors declare that they have no competing interests.
NMvS and PL primarily designed the D-Vitaal study, all other authors contributed to the design; PL is the principal investigator; NMvS is the trial coordinator; EJdK, NMvS, HWJvM, BWJHP, PJME and PL conduct the research, ACH coordinates the serum 25(OH)D determinations from blood samples; PMB coordinates the issuing of the study tablets; MWvT designed the economic evaluation study; MdH and JHS assist with the statistical analyses, EJdK collects the data (together with the research assistants) and drafted the manuscript; all authors provided critical revision of the manuscript and approved the final version.
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de Koning, E.J., van Schoor, N.M., Penninx, B.W. et al. Vitamin D supplementation to prevent depression and poor physical function in older adults: Study protocol of the D-Vitaal study, a randomized placebo-controlled clinical trial. BMC Geriatr 15, 151 (2015). https://doi.org/10.1186/s12877-015-0148-3
- Vitamin D
- Depressive symptoms
- Physical functioning
- Functional limitations
- Physical performance
- Older adults
- Randomized clinical trial