Enhanced preoperative education about continuous femoral nerve block with patient-controlled analgesia improves the analgesic effect for patients undergoing total knee arthroplasty and reduces the workload for ward nurses

Table 1 Anthropometric subject characteristics

Variable	Group A (n = 30)	Group B (n = 30)	P-Values
Age	66.6 ± 6.5	66.5 ± 8.1	0.986
Gender (female/male)	22/8	27/3	0.095
Height (cm)	158.8 ± 7.5	159.0 ± 7.7	0.919
Weight (kg)	66.3 ± 8.8	67.6 ± 11.2	0.601
BMI (kg/m²)	26.4 ± 4.1	26.7 ± 4.0	0.756
ASA physical status (class I/II)	12/18	15/15	0.436
CFNB performance
Side (left/right)	14/16	10/20	0.292
in PACU (pre−/post-op)	11/12	12/11	0.768
in OR (pre−/post-op)	6/1	7/0	1.000
Dosage of spinal bupivacaine (mg)	12.5 (12.5, 12.5)	12.5 (12.5, 12.5)	0.729
Upper thoracic sensory block level before surgery	10 (8, 10)	10 (8, 10)	0.629
Upper thoracic sensory block level immediately after surgery	10 (10, 10)	10 (10, 11)	0.564
Tourniquet application time (min)	62.1 ± 13.8	69.0 ± 14.7	0.349
Intraoperative blood loss (ml)	5 (5, 15)	10 (5, 20)	0.769
Duration of surgery (min)	74.3 ± 18.4	74.1 ± 18.1	0.972

Values are reported as mean ± SD or number of subjects. Non-normal data are expressed as median and interquartile values. ASA American Society of Anesthesiologists, BMI Body mass index, CFNB Continuous femoral nerve block

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