Analgesic Effects, Birth Process, and Prognosis of Pregnant Women in Normal Labor by Epidural Analgesia Using Sufentanil in Combination with Ropivacaine: A Retrospective Cohort Study

Table 1

Comparison of fetal umbilical artery blood flow between the two groups [ ± s].

Grouping	N	PI		RI		S/D
		Before analgesia	After analgesia	Before analgesia	After analgesia	Before analgesia	After analgesia
Control group	30	0.80 ± 0.22	0.85 ± 0.16	0.55 ± 0.11	0.59 ± 0.12	2.34 ± 0.11	2.59 ± 0.16
Research group	30	0.81 ± 0.21	0.80 ± 0.21	0.56 ± 0.14	0.55 ± 0.21	2.35 ± 0.12	2.54 ± 0.33
t value		0.303	1.037	0.307	0.905	0.336	0.746
value		>0.05	>0.05	>0.05	>0.05	>0.05	>0.05