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 6 Multivariable logistic regression analysis of vitamin d deficiency with age, season, adverse pregnancy history, and pregnancy history in women undergoing preconception care.
| Item | B | S.E. | Wald | df | Sig. | Exp(B) | 95% CI for Exp(B) | |
|---|---|---|---|---|---|---|---|---|
| Lower | Upper | |||||||
| Constant | 1.648 | 0.578 | 8.133 | 1 | 0.004 | 5.195 | – | – |
| Age | −0.057 | 0.018 | 10.478 | 1 | 0.001 | 0.945 | 0.913 | 0.978 |
| Adverse pregnancy history | −0.041 | 0.199 | 0.043 | 1 | 0.835 | 0.959 | 0.649 | 1.418 |
| Pregnancy history | 0.541 | 0.179 | 9.104 | 1 | 0.003 | 1.717 | 1.209 | 2.439 |
| Season (Winter) | 0.556 | 0.199 | 7.814 | 1 | 0.005 | 1.743 | 1.181 | 2.574 |
| Season (Spring) | 0.763 | 0.190 | 16.156 | 1 | 0.001 | 2.145 | 1.478 | 3.111 |
| Season (Summer) | 0.340 | 0.179 | 3.605 | 1 | 0.058 | 1.405 | 0.989 | 1.997 |