24 February 2026 : Clinical Research
Effects of Age, Season, and Pregnancy History on Vitamin D Status in Women Seeking Preconception Care
Manyu Wu BCDEF 1,2, Dan Liu ABCDEF 1*DOI: 10.12659/MSM.950280
Med Sci Monit 2026; 32:e950280
Table 2 Comparison of 25(OH)D levels and vitamin D deficiency rates among preconception care women across seasons [M (P25, P75)].
| Season | N | 25(OH)D (ng/mL) | Vitamin D deficiency (n/%) |
|---|---|---|---|
| Winter | 218 | 17.57 (14.77, 21.57) | 147 (67.43) |
| Spring | 282 | 17.14 (13.66, 20.25) | 204 (72.34) |
| Summer | 308 | 18.16 (14.51, 22.12) | 197 (63.96) |
| Autumn | 242 | 18.99 (15.43, 23.83) | 137 (56.61) |
| H value/χ value | 19.946 | 14.898 | |
| <0.001 | 0.002 |