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 4 Comparison of 25(OH)d levels and vitamin d deficiency rates in women undergoing preconception care with different pregnancy histories [M(P25, P75)].
| Pregnancy history | N | 25(OH)D (ng/mL) | Vitamin D deficiency (n/%) |
|---|---|---|---|
| No pregnancy history | 642 | 17.55 (13.54, 20.63) | 456 (71.08) |
| With pregnancy history | 408 | 619.22 (15.78, 23.69) | 229 (56.13) |
| Z-value/χ value | −6.429 | 24.423 | |
| <0.001 | <0.001 |