Table 3

Multivariate linear regression analyses of serum 25OHD levels

Coefficient95% CIp Value
Age−0.52−0.65 to –0.40<0.0001
Sex
  MaleReference<0.0001
  Female−1.40−1.88 to 0.91
Region of residence
  Urban−0.85−1.55 to 0.140.0189
  RuralReference
BMI−0.10−0.17 to 0.030.0034
Smoking
  Active0.47−0.42 to 1.360.3017
  Passive−0.04−0.62 to 0.530.8842
  NoReference
Season
  April−OctoberReference<0.0001
  November−March−3.38−3.97 to 2.79

  • Statistics were carried out using multivariable linear regression.

  • Model: adjusted for age, sex, region, BMI, smoking, season.

  • 25OHD, 25-hydroxyvitamin D; BMI, body mass index.