| Vitamin D concentrations | P value | |||
---|---|---|---|---|---|
Median | P25 | P75 | |||
Sex | Male | 22.73 | 17.63 | 28.92 | <0.0001 |
Female | 19.99 | 15.38 | 25.62 | Â | |
Age a | Q1 | 21.92 | 16.29 | 27.55 | 0.0006 |
Q2 | 21.18 | 16.39 | 27.26 | Â | |
Q3 | 21.07 | 16.44 | 27.15 | Â | |
Q4 | 20.52 | 15.24 | 26.76 | Â | |
Education level | Primary education | 22.17 | 16.77 | 29.41 | <0.0001 |
Middle education | 20.67 | 15.90 | 26.29 | Â | |
College or above | 21.04 | 16.16 | 26.35 | Â | |
Under primary | 20.40 | 15.92 | 26.47 | Â | |
Physical exercise | Never | 20.01 | 14.95 | 27.15 | <0.0001 |
Low | 20.76 | 16.04 | 26.25 | Â | |
High | 21.70 | 16.78 | 27.64 | Â | |
Alcohol consumption | Never | 20.64 | 15.84 | 26.51 | <0.0001 |
< 3 drink/week | 22.76 | 17.54 | 29.74 |  | |
≥ 3 drink/week | 24.23 | 18.86 | 31.23 |  | |
Cigarette smoking | Never | 20.66 | 15.93 | 26.55 | <0.0001 |
Ex-smoker | 23.16 | 17.68 | 29.82 | Â | |
Current smoker | 22.67 | 17.06 | 29.49 | Â | |
Milk consumption | No | 21.16 | 16.32 | 27.32 | 0.1909 |
< 250 ml/day | 20.74 | 15.90 | 26.93 |  | |
≥ 250 ml/day | 21.43 | 16.40 | 26.80 |  | |
Calcium or vitamin D supplements | No | 20.59 | 15.74 | 26.33 | <0.0001 |
Yes | 23.57 | 18.20 | 29.93 | Â | |
BMI b | Q1 | 21.42 | 16.03 | 28.72 | 0.0012 |
Q2 | 21.59 | 16.60 | 27.25 | Â | |
Q3 | 20.83 | 16.18 | 26.75 | Â | |
Q4 | 20.45 | 15.68 | 25.69 | Â | |
Community | urban | 20.16 | 15.44 | 25.65 | <0.0001 |
suburb | 22.75 | 17.94 | 29.77 | Â |