Variables | Â | Number (%) | Vitamin D (ng/mL) | P valuea | |
---|---|---|---|---|---|
Mean (SD)b | |||||
Total | Â | 1472 | (100) | 13.70 5.93 | Â |
Age, years | ≥30 | 813 | (55.2) | 14.56 6.14 | 0.009 |
<30 | 659 | (44.8) | 13.25 5.63 | Â | |
Sex | Male | 1178 | (80.0) | 14.29 6.00 | <0.001 |
Female | 294 | (20.0) | 11.31 4.95 | Â | |
Regular exercise, times per week | ≥3 | 535 | (36.3) | 14.37 6.09 | 0.001 |
<3 | 937 | (63.7) | 13.31 5.80 | Â | |
Smoking | Current | 428 | (29.1) | 14.83 6.42 | <0.001 |
Never/former | 1044 | (70.9) | 13.23 5.65 | Â | |
Risky drinkingb | Yes | 384 | (26.1) | 14.51 5.77 | 0.002 |
No | 1088 | (73.9) | 13.41 6.28 | Â | |
Body mass index, kg/m2 | <25 | 948 | (64.4) | 13.69 6.03 | 0.995 |
≥25 | 524 | (35.6) | 13.70 5.74 |  | |
Marital status | Married | 774 | (52.6) | 14.31 6.13 | <0.001 |
Unmarried | 698 | (47.4) | 13.01 5.62 | Â | |
Education level | ≥College | 994 | (67.5) | 13.83 5.94 | 0.20 |
≤Highs chool | 478 | (32.5) | 13.41 5.89 |  | |
Job tenure, years | <5 | 468 | (31.8) | 12.98 5.59 | 0.001 |
5–9 | 383 | (26.0) | 14.51 6.35 |  | |
≥10 | 621 | (42.2) | 13.73 5.84 |  | |
Job stress | Low | 1152 | (78.2) | 13.72 5.95 | 0.766 |
High | 321 | (21.8) | 13.61 5.86 | Â | |
Test seasonc | Spring | 300 | (20.4) | 12.53 5.09 | 0.001 |
Summer | 456 | (31.0) | 16.87 6.11 | Â | |
Autumn | 150 | (10.2) | 14.52 5.86 | Â | |
Winter | 566 | (38.5) | 11.54 5.93 | Â |