Table 3.

The association between maternal COVID-19 diagnosis and preterm births from mothers receiving the cesarean section

COVID-19	Preterm birth		OR† (95% CI)	OR‡ (95% CI)
	Yes	No
Free	363	5657	1.00	1.00
Confirmed	9	43	3.26 (1.58, 6.74)	3.71 (1.70, 8.03)

^†Crude ORs

^‡Adjusted for maternal age (14–24, 25–34, 35–54), occupation (employed, housewives, part-time), education (bachelor’s degree or above, high school, vocation degree, middle school or below), gravidity (1, 2, 3–10), parity (1, 2, 3–5), gestational hypertension (yes, no), preeclampsia (yes, no), gestational diabetes mellitus (yes, no), and premature rupture of membranes (yes, no)