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

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

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

CI confidence interval, MNA®-SF Mini Nutritional Assessment® – Short Form, Sβ Standardized regression coefficient
The model included only 1486 subjects because of missing data
^aFor the dichotomous variables, reference categories were coded as “0”
^bReference: “1–4 years”
^cReference: “Does not know or does not declare”
^dReference: “None”
^eReference: “Moderate”

ISSN: 1471-2318