Table 4 Factors associated with 25(OH)D by multiple linear regression for the period between April–June (n = 683)

mUVI

0.295 (0.229; 0.362)

< 0.001

Age (years)

−0.092 (−0.163; −0.022)

0.010

Education (years) - zero

−0.078 (−0.148; −0.010)

0.025

Marital Status

0.140 (0.072; 0.209)

< 0.001

Skin phenotype - V + VI

−0.079 (−0.145; −0.013)

0.019

Cognitive performance (MMSE score)

0.086 (0.016; 0.156)

0.016

Physical Activity - Low

−0.102 (−0.172; −0.034)

0.004

Supplement intake

0.246 (0.181; 0.315)

< 0.001

Undernutrition status (MNA-SF score)

0.076 (0.008; 0.145)

0.030

BMI (kg/m²)

−0.117 (−0.185; −0.050)

0.001