Table 1 Demographic characteristics of study population. Data reported as mean ± SD and N (%)

From: Impact of epidural labor analgesia using sufentanil combined with low-concentration ropivacaine on maternal and neonatal outcomes: a retrospective cohort study

	R (n = 1994)	SR (n = 1784)	P
Maternal age (y)	29.77 ± 3.93	30.04 ± 3.99	0.103
BMI	26.85 ± 3.287	26.59 ± 3.176	0.117
Gestational weeks	39.29 ± 1.051	39.33 ± 1.086	0.158
Multiparous	233 (13.2)	252 (12.5)	0.507
Complications	488 (27.7)	533 (26.4)	0.385
Oxytocin induction	752 (37.7)	698 (39.1)	0.373
Birth weight(g)	3377 ± 394.9	3381 ± 407.5	0.605

P-value is compared between the R group and the SR group
y Year, BMI Body mass index, g Gram

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