Table 1.
Association of serum 25(OH)D level with woman's general characteristics and season
| Characteristics | Group (n) | Serum 25(OH)D (mean ± SD ng/mL) | t/F | p |
|---|---|---|---|---|
| Age | 22–30 years (277) | 14.3 ± 5.0 | 2.203 | 0.029 |
| 31–44 years (133) | 15.6 ± 6.0 | |||
| BMI (kg/m2) | Underweight (46) | 13.7 ± 4.5 | 1.273 | 0.281 |
| Normal (293) | 14.9 ± 5.4 | |||
| Overweight and Obese (71) | 14.4 ± 5.7 | |||
| Gravidity | No (170) | 14.1 ± 5.1 | 1.813 | 0.071 |
| One and more (240) | 15.1 ± 5.6 | |||
| Parity | No (330) | 14.4 ± 5.3 | 2.290 | 0.023 |
| One (80) | 15.9 ± 5.7 | |||
| Numbers of induced abortion | No (293) | 14.7 ± 5.7 | 0.143 | 0.866 |
| One (85) | 14.7 ± 5.2 | |||
| Two and more (32) | 15.2 ± 6.2 | |||
| Employment status | Working (340) | 14.3 ± 5.2 | 3.127 | 0.002 |
| Non-working (70) | 16.5 ± 5.8 | |||
| Season | Spring (128) | 14.5 ± 5.1# | 16.417 | 0.000 |
| Summer (102) | 16.6 ± 5.0 | |||
| Autumn (88) | 15.9 ± 5.6 | |||
| Winter (92) | 11.8 ± 4.8* |
*Significantly lower compared to spring, summer, and autumn (all p < 0.01)
#Significantly lower compared to summer (p < 0.01)