Table 1 Comparison of demographic data in the intervention and control group
Variables | Vitamin D | Control | p-value |
|---|---|---|---|
Age (year) Mean ± sd | 26.40 ± 4.88 | 26.22 ± 4.33 | 0.80 |
Job N (%) | Â | Â | 0.96 |
 Housewife | 72 (96) | 75 (96.2) |  |
 Employed | 3 (4) | 3 (3.8) | |
Education N (%) | Â | Â | 0.55 |
 High school | 26 (34.7) | 21 (26.9) |  |
 High school diploma | 34 (45.3) | 38 (48.7) | |
 University | 15 (20.0) | 19 (24.4) | |
Parity | Â | Â | 0.17 |
 Nullipara | 41 (54.7) | 51 (65.4) |  |
 Multipara | 34 (45.3) | 27 (34.6) | |
Using others supplements | Â | Â | 0.017 |
 Yes | 55 (73.3) | 69 (88.5) |  |
 No | 20 (26.7) | 9 (11.5) | |
Planned pregnancy | Â | Â | 0.01 |
 Yes | 55 (73.3) | 69 (88.5) |  |
 No | 20 (26.7) | 9 (11.5) | |
Seasonal distribution in onset N (%) | Â | Â | 0.32 |
 Autumn | 9 (12) | 6 (7.7) |  |
 Winter | 11 (14.7) | 7 (9) | |
 Spring | 55 (73.3) | 65 (83.3) | |
Sun exposure(minutes) | Â | Â | 0.55 |
  < 15 | 14 (21.9) | 12 (16.7) |  |
 15–30 | 28(43.8) | 33 (45.8) | |
 30–60 | 10 (15.6) | 17 (23.6) | |
  > 60 | 12 (18.8) | 10 (13.9) |