Table 2 Effects of different characteristics on plasma concentration of 25-OH-vitamin D in several simple linear regression analyses and one multiple linear regression analysis (n = 61)
Univariate linear regression | Multiple linear regression | ||||
|---|---|---|---|---|---|
Variable | β-coefficient | R2 | P | β-coefficient | p |
Age (years) | 0.33 | 0.03 | 0.16 | -0.03 | 0.87 |
BMI (kg/m2) | -1.19 | 0.13 | 0.005 | -0.63 | 0.08 |
Native origin | 27.8 | 0.32 | <0.001 | -22.5 | 0.0001 |
Vitamin D intake, f + s (μg/day) | 1.6 | 0.12 | 0.06 | 0.14 | 0.76 |
Plasma calcium (mmol/L) | 41.4 | 0.02 | 0.26 | 28.1 | 0.30 |
Education >12 years | 8.1 | 0.08 | 0.03 | -0.02 | 0.99 |
Use of sunscreen | -5.7 | 0.03 | 0.15 | 0.98 | 0.75 |
Observed wearing of veil | -24.4 | 0.14 | 0.03 | -7.0 | 0.33 |
Sun holiday past year | 31.2 | 0.27 | <0.0001 | 25.2 | <0.0001 |
Skin type | -3.5 | 0.03 | 0.15 | -1.18 | 0.58 |
Current smoking | -9.8 | 0.02 | 0.22 | -6.6 | 0.28 |