Postoperative Analgesic Effects of Different Doses of Epidural Hydromorphone Coadministered with Ropivacaine after Cesarean Section: A Randomized Controlled Trial

Table 1

Demographic and obstetric data.

	Group H0 ()	Group H1 ()	Group H2 ()	Group H3 ()
Age (years)	32 ± 4	32 ± 4	33 ± 3	33 ± 3
Weight (kg)	71 ± 6	69 ± 6	69 ± 8	70 ± 7
Height (cm)	162 ± 4	161 ± 3	160 ± 4	160 ± 4
BMI (kg/m^2)	27 ± 2	27 ± 2	27 ± 2	27 ± 3
Gestation (weeks)	38 ± 1	38 ± 2	38 ± 1	38 ± 1
Operation time (min)	47 ± 9	45 ± 10	44 ± 13	41 ± 9

Data are mean ± SD. BMI = body mass index.