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Table 1 Association of serum 25(OH)D level with woman's general characteristics and season

From: Serum 25 hydroxyvitamin D levels and affecting factors among preconception fertile women

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*
  1. *Significantly lower compared to spring, summer, and autumn (all p < 0.01)
  2. #Significantly lower compared to summer (p < 0.01)