Table 5. Correlation of preterm birth with age adjustment and pregnancy complications.
| Pregnancy complications | Preterm birth without age adjustment | Preterm birth with an age adjustment | |||||
|---|---|---|---|---|---|---|---|
| OR | 95% CI | P value | OR | 95% CI | P value | ||
| PP | 17.502 | 14.197–21.576 | <0.001 | 16.778 | 13.563–20.755 | <0.001 | |
| GDM | 1.722 | 1.345–2.205 | <0.001 | 1.540 | 1.198–1.980 | <0.001 | |
| HYP | 2.449 | 1.352–4.527 | 0.004 | 2.191 | 1.177–4.079 | 0.013 | |
| ICP | 2.275 | 1.583–3.270 | <0.001 | 2.286 | 1.587–3.293 | <0.001 | |
| THY | 1.010 | 0.632,1.613 | 0.967 | 0.987 | 0.617–1.579 | 0.958 | |
| HEP | 1.040 | 0.698,1.550 | 0.848 | 1.001 | 0.670–1.495 | 0.996 | |
| PROM | 2.806 | 2.369–3.323 | <0.001 | 2.830 | 2.287–3.354 | <0.001 | |
| pPROM | 2.227 | 1.615–3.071 | <0.001 | 2.266 | 1.641–3.130 | <0.001 | |
PP, placenta previa; GDM, gestational diabetes mellitus; HYP, gestational hypertension; ICP, intrahepatic cholestasis of pregnancy; THY, pregnancy with thyroid dysfunction; HEP, pregnancy with HBV carrying; PROM, premature rupture of (fetal) membrane; pPROM, preterm premature rupture of (fetal) membrane <37 weeks; OR, odds ratio; CI, confidence interval.