Table 2.

Results of WOMAC subgroup analysis (length of follow-up).

Measurements	Number of included studies	Subgroup	I2 value (%)	SMD (95% CI)	P value
WOMAC (pain)	11	≤12 wk	62.7	−0.35 (−0.60, −0.10)	.007
	10	˃12 wk	70.1	−0.53 (−0.79, −0.26)	.001
WOMAC (stiffness)	10	≤12 wk	65.9	−0.28 (−0.57, 0.00)	.048
	9	˃12 wk	76.0	−0.43 (−0.74, −0.12)	.007
WOMAC (function)	9	≤12 wk	33.3	−0.41 (−0.64, −0.18)	.0001
	9	˃12 wk	76.9	−0.61 (−0.96, −0.26)	.001

Bold values in the tables indicate meaningful results with P < .05.

WOMAC = Western Ontario and McMaster Universities Osteoarthritis Index.