Table 4.

Comparison of pain and comfort scores between five groups before and after surgery

Groups	Patients	Pain score(VAS)			Comfort score
		Preoperative	Postoperative		Preoperative	Postoperative
			1 day	3 days		1 day	3 days
1 hour	46	2.71 ± 0.27	2.26 ± 0.18	1.91 ± 0.14	88.52 ± 1.54	89.85 ± 1.37	92.00 ± 1.18
6 hours	46	2.41 ± 0.27	1.87 ± 0.19	1.66 ± 0.15	88.76 ± 1.52	93.04 ± 1.37	95.11 ± 1.18
12 hours	45	2.69 ± 0.27	2.30 ± 0.18	1.72 ± 0.14	89.29 ± 1.56	90.94 ± 1.38	91.73 ± 1.19
18 hours	45	2.89 ± 0.27	2.29 ± 0.19	1.91 ± 0.15	88.91 ± 1.56	91.40 ± 1.38	93.33 ± 1.19
20 hours	46	2.26 ± 0.27	2.05 ± 0.18	1.73 ± 0.14	89.96 ± 1.54	90.39 ± 1.37	92.80 ± 1.18
P values		Pa=0.638, Pb=0.206, Pc<0.001			Pa=0.842, Pb=0.288, Pc<0.001

VAS: visual analogue scale

P_a indicates interaction effec; P_b indicates effect between groups;P_c indicates time effect.