TABLE 3.

Subgroup analysis of the trials that compared ECCM with CM alone.

	k	Effect size (g)	95% CI	Heterogeneity (I2)	P (%)subgroup
Type of control group					0.0365
Opioid use	6	−1.3363	−1.4959; −1.1767	90.8
Other CM	3	−2.5206	−2.9160; −2.1252	55.7
Duration of treatment					0.2061
>2w	7	−1.3841	−1.5414; −1.2267	73.8
≤2w	2	−2.4082	−2.8440; −1.9724	95.3

CM, conventional medicine; ECCM, East Asian herbal medicine combined conventional medicine.