Table 3.

Comparison of the amount of pain relief between primiparas and multiparas.

Variables	Primiparas (n = 82)	Multiparas(n = 99)	z/χ2	P
Duration of labor analgesia (h)	8.00 (4.50, 10.77)	3.25 (1.93, 6.23)	6.32a	<0.001
Patients requiring manual bolus, yes	75 (91.5)	94 (94.9)	0.88b	0.348
Total PCEA manual boluses	12.48 (6.54, 17.42)	8.20 (3.63, 13.88)	2.80a	0.005
PCEA successful manual boluses per hour	1.77 (0.90, 2.47)	2.68 (1.65, 3.85)	4.52a	<0.001
Hourly analgesic consumption (mL/h)	17.24 (11.52, 21.36)	23.00 (16.00, 28.25)	4.63a	<0.001
Average analgesic consumption (mL/h·kg)	0.26 (0.19, 0.35)	0.35 (0.24, 0.45)	3.92a	<0.001

Note: Data are n (%), Median (P₂₅, P₇₅). ^a Mann–Whitney tests; ^b chi-square tests. PCEA = patient-controlled epidural analgesia.