Table 6.

Four-category analysis of WOMAC reduction of patients with knee osteoarthritis in three groups

Index	Zhuanggu group (n = 136)	Combination group (n = 138)	Celecoxib group (n = 140)	Z	P
Efficacy at week 4, n (%)				15.50	0.0004
Ineffective	14 (10)	3 (2)	15 (11)
Improved	33 (24)	24 (17)	35 (25)
Significantly improved	66 (49)	67 (49)	60 (43)
Clinically controlled	23 (17)	44 (32)	30 (21)
Efficacy at 8 weeks, n (%)				51.39	<0.0001
Ineffective	7 (5)	2 (1)	15 (11)
Improved	23 (17)	5 (4)	34 (24)
Significantly improved	77 (57)	69 (50)	68 (49)
Clinically controlled	29 (21)	62 (45)	23 (16)

WOMAC: Western Ontario and McMaster Universities Osteoarthritis.