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Table 2 Factors associated with 25(OH)D (nmol/L) by multiple linear regression for the period between December–June (n = 1486)

From: Association between serum 25-hidroxyvitamin D concentrations and ultraviolet index in Portuguese older adults: a cross-sectional study

Independent variables Sβ (95%CI) P value
mUVI 0.244 (0.198; 0.291) < 0.001
Age (years) −0.135 (−0.184; −0.086) < 0.001
Residence (home - 0; institution - 1)a −0.064 (−0.110; −0.019) 0.005
Education (years)b
 0 −0.060 (−0.106; −0.014) 0.010
 5–12 0.052 (0.007; 0.096) 0.022
Marital status (not married - 0; married - 1)a 0.089 (0.042; 0.137) < 0.001
Household income (€ / month)c
 500–999 0.056 (0.011; 0.101) 0.015
  ≥ 1000 0.099 (0.052; 0.145) < 0.001
Physical activity (normal - 0; low - 1)a −0.078 (−0.124; −0.033) 0.001
Alcoholic beverages consumption - moderate d 0.054 (0.011; 0.098) 0.015
Self-perceived health - bad e −0.051 (−0.096; −0.007) 0.024
Supplement intake (no - 0; yes - 1)a 0.202 (0.158; 0.245) < 0.001
Undernutrition status (MNA®-SF score) 0.070 (0.025; 0.115) 0.002
BMI (kg/m2) −0.123 (−0.168; −0.079) < 0.001
  1. CI confidence interval, MNA®-SF Mini Nutritional Assessment® – Short Form, Standardized regression coefficient
  2. The model included only 1486 subjects because of missing data
  3. aFor the dichotomous variables, reference categories were coded as “0”
  4. bReference: “1–4 years”
  5. cReference: “Does not know or does not declare”
  6. dReference: “None”
  7. eReference: “Moderate”