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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)

From: Evaluation of sun holiday, diet habits, origin and other factors as determinants of vitamin D status in Swedish primary health care patients: a cross-sectional study with regression analysis of ethnic Swedish and immigrant women

  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
  1. R2 = 0.62.
  2. f + s = food supplements.