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Table 2 Factors associated with serum 25-hydroxyvitamin D (25OHD) < 25 nmol/L

From: Vitamin D deficiency was common among nursing home residents and associated with dementia: a cross sectional study of 545 Swedish nursing home residents

  Unadjusted odds ratioa(95% CI; p-value) Adjusted odds ratiob (95% CI; p-value)
Age 0.98 (0.96–1.0; p = 0.12) 0.98 (0.95–1.0; p = 0.22)
Genderc 1.1 (0.74–1.5; p = 0.72) 1.4 (0.92–2.2; p = 0.12)
Vitamin D supplementation 0.073 (0.031–0.17; p < 0.001) 0.075 (0.031–0.18; p < 0.001)
Fitzpatrick skin phototype (4–6)d 0.54 (0.36–0.80; p = 0.0022) 0.69 (0.44–1.1; p = 0.12)
Hours outdoors/weeke 0.98 (0.96–1.0; p = 0.15) 0.99 (0.96–1.0; p = 0.62)
Lack of appetite ≥3 months 0.93 (0.66–1.3; p = 0.66) 0.75 (0.50–1.1; p = 0.15)
Dementia 2.4 (1.7–3.4; p < 0.001) 2.3 (1.5–3.4; p < 0.001)
Antibiotics last 6 months 1.2 (0.85–1.8; p = 0.28) 1.6 (1.1–2.6; p = 0.029)
  1. aN = 545 for age, gender, vitamin D supplementation, lack of appetite and dementia. N = 541 for Fitzpatrick skin phototype. N = 489 for hours outdoors/week. N = 543 for antibiotics last 6 months
  2. bN = 488 included in analysis. Adjusted logistic regressions with 25OHD < 25 nmol/L as the dependent variable and the following independent variables: age, gender, vitamin D supplementation, Fitzpatrick skin phototype, hours outdoors/week, lack of appetite, dementia and antibiotics last 6 months
  3. cReference category: male
  4. dReference category: Fitzpatrick skin phototype 1–3
  5. eAverage number of hours outdoors/week during April to August
  6. Statistically significant findings are bold