Table 3.

The comparison of the mean knee clinical and knee functional scores in three groups

KSS score	Control group (n=85)	Gabapentin group (n=86)	Celecoxib group (n=87)	P 1	P intervention	P time×intervention
KSS clinical score
Preoperative	45.11±4.82	45.89±4.99	44.91±5.96	0.385	<0.001	<0.001
1 month	78.90±4.39a	85.40±5.47b	87.03±3.97c	<0.001
3 months	83.89±3.44a	87.24±4.18b	88.37±3.09b	<0.001
6 months	87.96±3.54a	88.85±2.93a	89.64±2.67b	0.009
P time	<0.001	<0.001	<0.001
KSS functional score
Preoperative	48.94±4.49	49.24±5.33	48.69±5.51	0.763	<0.001	<0.001
1 month	81.74±4.49a	84.83±4.92b	87.30±3.73b	<0.001
3 months	86.02±4.23a	86.53±4.53	87.77±5.19b	0.043
6 months	89.84±4.11	88.53±3.95	89.59±2.78	0.092
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. P₁=Resulted from one-way ANOVA for comparing mean pain score between three groups at each follow-up time point; 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; ANOVA=Analysis of variance; KSS=Knee Society Score