Expenditures of medicine use in hypertensive/diabetic elderly and physical activity and engagement in walking: cross secctional analysis of SABE Survey
© The Author(s). 2017
Received: 18 August 2015
Accepted: 31 January 2017
Published: 20 March 2017
The literature shows the inverse association between physical activity level (PAL) and chronic diseases that have a significant burden over health care costs. However, in upper-middle income countries and in elderly population this information are scarce.
To describe the annual drug expenditures for the hypertensive and diabetic elderly population in Brazil and to analyze the association with PAL and engagement in walking.
This cross sectional study is part of SABE Survey and comprised 806 hypertensive and/or diabetic elderly (≥60 years old). The annual expenditures of medicine use was estimated for all medications for hypertension and/or diabetes they were taking. The PAL was considered insufficient when moderate physical activity was <150 min/week or vigorous physical activity was < 75 min/week. Engagement in walking was considered by at least 1 day a week. All expenditures were presented through the descriptive values (in American Dollars US$) according PAL and engagement in walking. The association analysis between annual expenditures, PAL and engagement in walking were performed by multiple logistic regression models adjusted for gender, age and body mass index.
The average annual cost was higher in diabetic and insufficient physically activity elderly. The 1-year estimated.cost was US$ 73386,09 and 295% higher in insufficiently physically active. Older people who reported not walking had a higher risk to higher annual expenditures of medicine use (OR = 1.57, 95% CI 1.03–2.40).
The annual expenditures of medicine use for controlling hypertension and diabetes of Brazilian elderly were higher and inversely associated with physical activity level and engagement in walking.
KeywordsExpenditures Physical Activity Elderly Medicine use Hypertension Diabetes
The prevalence of hypertension (HTS) among elderly latinos (Mexico, Paraguay and Venezuela) is 67.3% in men and 61.1% in women, increasing to 70% among those seniors aged 70 or higher . For diabetes mellitus (DM), according to data provided by the Base Population Health Census taken in municipalities in São Paulo state, the disease was self-reported by 14.9% of men and 15.8% of women over 60 years old .
There is increasing literature, identifying that chronic diseases have a significant burden over health care costs [3, 4]. In the pharmacological intervention for control of HTS and DM, the simultaneous use of more than one type of drug is quite common, with direct consequences to the costs billed to the health system. Compared to normotensive and non-diabetic patients, drug costs are higher for those affected by the disease [5, 6] Among the non-pharmacological methods of control, physical activity (PA) is widely recommended for hypertensive  and diabetic persons  due to its effect in lowering at-rest blood pressure  and glycemia [10, 11]. Williams  showed that the use of drugs was lower as a result of engaging in walking exercise. Other studies showed that intervention by means of PA results in lower overall health care costs  and, specifically, lower drug use [14, 15]. Analysis of expenditures in Canadá estimates that in 2009 the direct costs due to hypertension (US$ 588 million) and DM (US$ 470 million) directly attributable to physical inactivity (<150 min per week) are higher than those among active people . Tsuji et al.  demonstrated lower healthcare costs in a population of physically active seniors.
Investigations of this nature are extremely important given the phenomenon of the transition of the populational age structure, and the resulting increase in the numbers of older people, who also have the highest health care costs in comparison to young adults [6, 18]. A Brazilian study estimated that the costs of controlling DM will reach US$ 8.7 billion in 2050, corresponding to the increase of US$ 3.7 billion when compared to 2010. For HTS, the analyses indicate that, in 2050, the cost will reach US$ 657 million . In the US, the cost of drugs for treatment of DM represents 28% of the available healthcare resources and for treatment of hypertension the main cost was the use of drugs .
However, information of this nature in Brazil is still scarce, especially as regards large populational studies focused on the elderly. The aim of this study was to describe the annual drug cost for the elderly population of the city of São Paulo and to analyze the association of these costs with PA level and walking.
The SABE Survey and sample
The SABE Survey (Health, Welfare and Aging Survey) is a home-focused epidemiological study and the aim was to investigate health characteristics relating to the elderly population in developing countries. In Brazil, the SABE Survey was developed in the urban area of the capital of São Paulo state and it was approved by the Ethics Committee of the Public Health School of University of São Paulo, control number 475,455. The participants were invited to read and approve a consentient letter before to start all the assessments and interviews, where was explained about sharing their data (age, self-reported data, physical activity level and others) to scientific work, and agreeing about their names or personal data wouldn’t be used in the publications. The datasets generated and/or analyzed during the current study which were used under license for the current study are not publicly available due to the policy of SABE Survey, and so are not publicly available. Data are however available from the authors upon reasonable request.
For this cross-sectional study, the SABE data used was collected in 2010, and comprised a total of 1,211 elderly people. However, in order to meet the objective of investigating the association of drug costs among hypertensive and/or diabetic seniors, only those who reported these diseases in the interview were included in this sample. Those seniors were also excluded that did not include complete information in the questionnaire, as was necessary for analysis (body mass or/and height). Having satisfied the requirements described, 806 elderly individuals participated in the study.
Outcome variable - annual expenditures of medicine use
Estimated daily amount consumed: this was determined by the Defined Daily Dosage (DDD), which is the average daily dosage of the drug in its use for its main indication ;
Price identification: this data was taken from a survey of the Healthcare Price Database (http://www.bps.saude.gov.br), and considered the amount of the dosage unit (1 tablet, 1 pill or 1 capsule).
Estimation of monthly and annual expenditures: the daily cost estimated from the DDD was multiplied by 30 (days) for each product, and then multiplied by 12 (months), to reflect the annual cost. Then, a currency value update was carried out based on the most recent data available from the Consumer Price Index as provided by the Brazilian Institute of Geography and Statistics (IBGE-IPCA).
Annual expenditures of medicine use was divided into quartiles, with the last quartile of cost (US$ ≥ 75th) considered as highest expenditures group. The first three quartiles (US$ < 75th) represent the lowest annual expenditures group.
Physical activity level and walking
The participants’ physical activity was self-reported using the short version of the International Physical Activity Questionnaire (IPAQ). The elderly were classified according to their physical activity level (PAL) in accordance with current recommendations : i. Active: ≥ 150 min/ week of moderate PA, or ≥ 75 min/ week of vigorous PA; ii. Insufficiently active: <150 min/ week of moderate PA or <75 min/ week of vigorous PA.
Walking was reported according to the weekly frequency of engagement. The elderly were divided into two groups: i) Yes: Seniors who walked at least 1 day a week; ii) No: older adults who did no walking. Moreover, to see the difference on costs according to the frequency of walking in a week they were divided into three groups: i) ≥ 4 days a week; ii) 1 to 3 days per week; iii) does not walk (0 days per week).
This is a population-based study derived from complex samples. So, the statistical analyses and tests used were those indicated for use with survey-type studies (svy).
For the complete visualization of costs, in Dollars (US$), they are presented through the mean values and their respective 95% confidence intervals (CI 95%), median values and values of percentile 25 (25th) and percentile 75 (75th).
To association analysis the expenditures of medicine use (outcome variable) was divided into quartiles, with the last quartile of cost (US$ ≥ 75th) considered a risk category (highest cost). The first three quartiles (US$ < 75th) are representing the reference category (lowest cost). The multiple logistic regression models (Rao & Scott test) were adjusted for sex, age and body mass index, and comorbidities.
To examine associations of costs with PAL (reference: active, risk: insufficiently active) and walking (reference: walking ≥ 4 days, risk: walking < 4 days) by gender, three multiple logistic regression models were performed separately, using these variables as explanatory variables, including analysis for men and women. The overall regression model was performed adjusted by gender, Body Mass Index (BMI), age, marital status, socioeconomic status and education level. The other analyses (separated according to gender) were adjusted for age and BMI. The significance level was established in 5% for all analysis and statistical analyses were provided by Stata 10.1.
Of the 806 elderly individuals in the sample, 60.9% were female (n = 526), 95.9% (n = 767) reported being affected by high blood pressure and 62.5% (n = 295) for diabetes, with no differences in the prevalence of HTS and DM by gender (p > 0.05). The average age of the sample was 70.7 (95%-CI = 70.2 to 71.3) years of age and does not differed between the hypertensive and diabetic.
The total number of drugs for hypertension and diabetes was 2,141, being 1,770 antihypertensive and 371 anti-diabetic, with an average of 2.6 (95%-CI 2.5–2.7) drugs per elderly, with no difference between sexes (p > 0.05). In seniors who only had HTS, the average was 2.0 (95%-CI 1.9–2.2) medicines without a difference according PAL (p > 0.05). The average use of antidiabetic drugs in patients that reported only DM was 2.2 (95%-CI 1.7–2.7), with no difference between PAL and walking exercise (p > 0.05). In patients that reported both diseases, the average of antihypertensive and antidiabetic drugs was 3.8 (95%-CI 3.6–4.1). When considering all the drugs taken by the 806 seniors, 72.2% were presented by elderly people with an insufficient PAL.
Description of annual expenditures for medicine use according gender, PAL and walking. (São Paulo, 2015 [n = 806])
Annual expenditures of medicine use-US$
Mean (CI 95%)-Median [25th- 75th]
Sum - ∑
85.40 (68.79–102.00) – 20.89 [15.05; 53.05]
84.90 (54.55–115.25) – 17.71 [3.22; 49.03]
85.72 (66.65–14.79) – 21.69 [4.82; 54.64]
60.57 (43.83–77.32) – 16.67 [4.82; 43.42]
95.07 (72.99–117.16) – 22.49 [4.82; 54.68]
77.55 (59.57–95.54) – 17.71 [3.22; 44.97]
102.03 (67.05–137.02) – 25.71 [6.41; 62.64]
102.03 (52.16–107.92) – 25.71 [6.41; 62.64]
74.13 (55.32–92.94) – 20.89 [4.82; 57.87]
≥ 4 days
80.04 (67.19–137.02) – 17.67 [3.22; 41.79]
Costs by medication type
Prevalence of medicine use (%) and annual expenditures sum (∑ − US$) according to medicine type. (São Paulo, 2015 [n = 806])
Type of medication
Prevalence of medicine use (%)
∑ Annual Cost
Renin Angiotensin System controller
Calcium channel blockers
Association between PAL and walking with higher annual expenditures of medicine use (≥75th), to overall sample and according to gender
Annual expenditures of medicine use (≥75th)
Overall (n = 806)
Men (n = 281)
Women (n = 525)
Model 1 PAL
Model 2 Walking
Model 3 Walking
≥ 4 days
The aim of the present study was to describe the annual medication expenditures for hypertensive and diabetic older adults and to analyze their associations with PAL and weekly engagement in walking. The results showed inverse associations for engagement in walking, adjusted for gender, age and BMI.
As indicated in the literature , hypertensive had higher use and cost of medications when compared to normotensive. Therefore, studies suggest that PA, especially aerobic training, helps in keeping blood pressure at normal levels, resulting in a reduced need for medication use and costs. Even though the PA was of moderate intensity, such as walking [22–24], it exerts hypotensive effects and controlling the disease. This study was grounded in this information and therefore was based on the assumption that costs would be lower among physically active hypertensive older adults. Indeed, our results are confirming the literature because indicates that there is a positive and direct relationship between the annual cost per person and the control rate of hypertension, where-in Brazil-the monthly cost for the pharmacological control of hypertension is lower when blood pressure was < 140/90 mmHg .
Likewise, the cost for non-diabetic elderly is lower than the cost for diabetic  and physical inactivity is present in most individuals affected by DM . On the other hand, there are also indications that a physically active lifestyle mitigates this situation and contributes to the regulation of blood glucose [28, 29] and a decreased risk of complications related to DM due to the improved metabolic profile of these individuals . Thus, in addition to the cost of the disease, diabetic individuals with a lower PAL present higher costs for medications for other conditions .
In direction of these findings, in a 2-year study of Italian diabetic sufferers with an average age of 62, those who managed to increase energy expenditure through PA showed an equivalent reduction in drug use costs . But, these results about PAL were not concordant with our results. However, our findings are in agreement with Codogno et al. , who did not observe lower drug costs for these different PAL among diabetic elderly, however, there was an inverse association of costs with the overall PA (OR 2.12, 95% CI 1.18–3.78) when considering the domains of work and sports activities together. On the other hand, the costs for controlling both diseases were lower with engagement in walking as shown by Williams  who showed a lower rate of use of antidiabetic and antihypertensive medications in physically active individuals. Thus, further studies with the elderly population are needed to more clearly elucidate the associations of physical activity and walking to reducing drug costs.
On these disagreements in literature, a plausible explanation would be the self-reported method of analysis of physical activity. It is noteworthy that the PAL estimated by the IPAQ in this study was largely carried out in the free time of those who reported it. In addition, studies demonstrate that the PAL estimated by the IPAQ may be overestimated  to the extent that seniors classified as physically active may not actually be, thus diminishing the strength of the association of physical inactivity to costs for the entire sample. On the other hand, these results are similar to Tsuji et al. , who observed inverse associations between cost and engagement in walking. In this regard, IPAQ validation studies show that the correlation of responses relating to walking with objective measurements (accelerometer) is greater than that relating to the responses for moderate and vigorous PA, especially in older women . Thus, different areas of PA can be linked in different ways to healthcare costs, and the sum of daily energy expenditure may be the real determinant in cost reductions, such that further studies are needed to investigate these associations in Brazilian older adults, the results of which would indicate the best alternatives for intervention projects.
As regards the expenditures in diabetics, one possible explanation is the need for constant use of insulin, regardless of the PAL due to dysfunction of beta cells, which irreversibly reduces their natural production. Kaizu et al.  observed that although leisurely PA entails positive effects on the metabolic profile of diabetic patients, the proportion of individuals using oral hypoglycemic agents was not lower in individuals who were classified as active.
As it relates to public health interventions, the results presented are of extreme value and, when added to the results of other studies [34, 35], demonstrated that non-pharmacological intervention procedures for blood glucose and blood pressure control, especially through engagement in walking, have conclusive results and are cost-effective, and point to possible cost savings through primary prevention strategies. Thus, it can be inferred that these intervention strategies can result in the positive effect of reducing the costs associated with the control of the disease, since the cost savings at this primary level would mean lower costs at subsequent levels of public health services .
The PA at internationally recommended levels [22, 37] was low for both hypertensive and diabetic subjects. It is worth noting that studies are consistent in showing a greater prevalence of hypertension in insufficiently active individuals, especially among older adults . Additionally, there is evidence that the risk of hypertension decreases concomitantly as level of cardiorespiratory fitness is increased . Thus, our results are showing that the primary prevention strategy for reducing risk variables through aerobic training as walking seems to be feasible and economically interesting. Specifically in the case of Brazilian costs, a study published in 2010 showed that the cost of HTS reached US$ 398.9 million, consuming 1.43% of the resources of the nationalized healthcare program , and of this amount, 52.3% was spent with medication. Thus, since walking can be an aid in controlling the disease and reducing medicine use, this study points to a necessary and plausible intervention strategy to be employed among the older adults, aimed at saving financial resources for healthcare program.
In addition, the benefits of PA or walking may be more significant if we consider the lower costs classified as indirect and/or intangible, both by improving quality of life and well-being, as well as the inverse association of PAL to the risk of mortality among the hypertensive  and diabetic . Other Brazilian population studies should be performed with the purpose of presenting the indirect costs associated with physical inactivity in order to strengthen the basis for the elaboration of public policies aimed at saving financial resources.
This study stands out for having been conducted with a representative sample of older adults living in São Paulo, however, it has some limitations. Readers need to do generalizations carefully. There are not a rural sample in this analysis, and Brazilians older people are classified according to the age ≥ 60 years-old. Although the estimate of the PAL through the IPAQ is feasible in epidemiological studies  and commonly performed in population surveys [39, 44, 45], it can be overestimated , and merits care in the interpretation of the results presented. Another limitation is the self-reported diagnosis of HTS and DM via interview format, which increases the chance of healthy seniors composing the sample and/or hypertensive or diabetic seniors being excluded from the analysis. It is noteworthy that this study did not carry out comparisons between elderly patients affected and not affected by the disease, nor were HTS and DM considered the conclusion of the analysis. Thus, memory bias does not seem to be a problem for the interpretation of the results of this study.
In conclusion, engagement in walking was inversely associated with the annual cost due to medication use, independent from body mass index, gender and age, among hypertensive and/or diabetic older adults living in São Paulo city, Brazil. The epidemiological evidence of this study conducted with a representative sample of older hypertensive and diabetic individuals indicates the prospect of physical activity interventions. Thus, PA plays an important task saving public health resources and controlling chronic diseases among the elderly adults. Moreover, the cross-sectional design prejudices the conclusions regarding the relationship between medicine use expenditures and PAL or walking.
Body Mass Index
Defined Daily Dosage
Physical Activity level
CAPES-Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior.
The research was made possible by generous funding from the Brazilian funders FAPESP (Fundação de Amparo à Pesquisa do estado de São Paulo) and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior).
Availability of data and materials
The datasets analyzed in the current study were used under license and are not publicly available due to the policy of SABE Survey.
DRB has made substantial contributions to conception, design of study and made statistical analysis. MFNM has given final approval of the version to be published and revised it critically for important intellectual content. LAG has been involved in drafting the manuscript and revising it critically for important intellectual content. MLL and YAOD conceived of the study, and participated in its design and coordination and helped to draft the manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Ethics approval and consent to participate
The study was approved by the Ethics Committee of the Public Health School of University of São Paulo, control number (475,455). Participants were invited to read and approve a consent letter before the start of the assessments and interviews.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
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