Table 7. Comparison of adverse events between the two groups.

CEA: continuous epidural analgesia, CPNB: continuous peripheral nerve block

Minor adverse event	CEA group (n = 41)	CPNB group (n = 36)	P-value	Overall (N = 77)
Pruritus	2 (4.9%)	1 (2.8%)	0.63	3 (3.9%)
Nausea	20 (51.2%)	5 (13.9%)	0.001	25 (32.5%)
Constipation	15 (36.6%)	3 (8.3%)	0.004	18 (23.4%)
Urinary retention	4 (9.8%)	0	0.006	4 (5.2%)
Light-headedness	1 (2.4%)	0	0.35	1 (1.3%)
Altered mental status	1 (2.4%)	0	0.35	1 (1.3%)
Average number of minor adverse events per patient	1.02	0.25	0.0002	0.66