Table 1.

The baseline characteristics and perioperative clinical data

Variables	IV-PCA alone (n = 29)	IV-PCA plus ESPB (n = 29)
Age (yr)	43.9 ± 7.9	44.7 ± 8.9
Weight (kg)	59.8 ± 8.9	57.4 ± 10.7
Height (cm)	161.1 ± 5.2	160.0 ± 4.7
BMI (kg/m2)	22.9 ± 3.1	22.4 ± 3.5
ASA status (I/II)	23/6	25/4
Hemoglobin (mg/L)	12.8 ± 1.0	12.5 ± 1.3
Duration of anesthesia (min)	246.3 ± 38.6	246.8 ± 39.8

Values are presented as mean ± standard deviation or number only.

IV-PCA: intravenous patient-controlled analgesia, ESPB: erector spinae plane block, BMI: body mass index, ASA: American society of anesthesiologists.