Table 3.

Total amount of patient-controlled analgesia and rescue medications.

	PCAIB group	PCA group	p
Amount of medications (mL)
24 hours postoperatively	57.76 ± 23.29	87.29 ± 33.73	<0.001∗
48 hours postoperatively	114.86 ± 40.97	183.63 ± 44.83	<0.001∗

Continuous variables were described as mean ± standard deviation and independent t-test was used; ^∗statistical significance was considered when p < 0.05.

PCAIB: patients with interscalene block in combination with intravenous patient-controlled analgesia.

PCA: patients receiving intravenous patient-controlled analgesia alone without interscalene block.