Table 2.

The comparison of mean pain score of patients in the three groups

Pain score	Control group (n=85)	Gabapentin group (n=86)	Celecoxib group (n=87)	P 1	P intervention	P time×intervention
Postoperative (h)
12	3.73±1.05a	2.46±0.79b	2.71±0.93b	<0.001	<0.001	0.07
24	2.89±0.95a	1.64±0.66b	1.78±0.65b	<0.001
48	2.37±0.94a	0.99±0.68b	1.03±0.72b	<0.001
Hospital discharge
Immediately	1.80±0.76a	0.35±0.48b	0.29±0.45b	<0.001	<0.001
1 month	0.64±0.74a	0.08±0.28b	0.19±0.39b	0.001		<0.001
3 months	0.29±0.56a	0b	0.02±0.15b	0.012
6 months	0.14±0.35a	0b	0b	0.110
P time	<0.001	<0.001	<0.001

The different superscript letters indicating difference in mean pain score between two groups based on post hoc test. P_intervention, P_time and P_{time×intervention} obtained from repeated-measures ANOVA. P_intervention=Overall difference between three groups over the follow-up period; P_time=The change in mean pain score in each intervention group over the follow-up period; P_{time×intervention}=The interaction between time and intervention; P₁=Resulted from one-way ANOVA for comparing mean pain score between three groups at each follow-up time point; ANOVA=Analysis of variance