Table 5 Results of a multiple linear regression analysis on determinants of serum 25(OH)D in men (n = 3,021)
Variable | B | SE | p-value |
|---|---|---|---|
Intercept | 33.634 | 3.351 | 0.000 |
Age (per year) | 0.044 | 0.029 | 0.125 |
Season (ref. winter) | |||
Spring | 7.613 | 1.145 | 0.000 |
Summer | 29.455 | 1.244 | 0.000 |
Autumn | 19.454 | 1.081 | 0.000 |
Latitude (ref. 52°-54°) | |||
47°-49° | 5.769 | 1.088 | 0.000 |
50°-51° | −0.496 | 1.004 | 0.621 |
Vitamin D intake index (ref. low intake) | |||
Intermediate intake | 2.867 | 1.023 | 0.005 |
Higher intake | 3.289 | 0.979 | 0.001 |
Vitamin D supplement use | 10.891 | 4.767 | 0.022 |
Body Mass Index (kg/m2) | −0.337 | 0.095 | 0.000 |
Socio-economic status (ref. low) | |||
Middle | 1.228 | 1.113 | 0.270 |
High | −0.505 | 1.331 | 0.704 |
Sport activity (ref. no activity) | |||
<2 h per week | 6.773 | 0.974 | 0.000 |
> = 2 h per week | 10.692 | 1.068 | 0.000 |
Media use (ref. up to 1 h per day) | |||
TV, DVD, video | |||
1- < 3 h | −1.729 | 1.014 | 0.088 |
> = 3 h | −5.634 | 1.472 | 0.000 |
Computer, Internet, computer games, game consoles | |||
1- < 3 h | −2.153 | 0.956 | 0.024 |
> = 3 h | −6.422 | 1.429 | 0.000 |
Residential traffic | |||
Living near a road with… | |||
(ref. very little traffic) | |||
Fair amount or quite a lot of traffic | −2.469 | 0.891 | 0.006 |
Heavy or extremely heavy traffic | −1.978 | 1.085 | 0.068 |
corr. r2 = 0.274 |