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Table 3 The mean 25(OH)D levels by season after stratification by age and by women’s employment status (mean ± SD ng/mL)

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

Season Employment status Age
Working (n = 285) Non-working (n = 57) 22–30 years (n = 241) 31–44 years (n = 101)
Spring 13.7 ± 4.6 17.3 ± 5.8 14.5 ± 5.0 14.7 ± 5.5
Summer 16.4 ± 4.9 17.7 ± 5.5 16.1 ± 4.9 17.5 ± 5.1
Autumn 15.9 ± 5.6 15.6 ± 5.7 15.7 ± 5.1 16.3 ± 6.7
Winter 11.5 ± 4.6 13.8 ± 6.0 11.0 ± 3.8 13.6 ± 6.5
F 17.013 1.384 15.655 2.664
p 0.000 0.256 0.000 0.051