Table 3. Sensitivity analysis of efficacy.

Sensitivity analysis	Symptom score			Medication score
	No. of studies	SMD (95% CI)	P value	No. of studies	SMD (95% CI)	P value
Fixed−effects model	25	−0.69 [−0.78, −0.60]	<0.00001	15	−0.57 [−0.67, −0.47]	<0.00001
Excluded small studies (n<30)	15	−1.62 [−2.28, −0.96]	<0.00001	9	−1.31 [−1.89, −0.74]	<0.00001
Excluded open label trials	22	−1.19 [−1.74, −0.65]	<0.0001	12	−1.00 [−1.42, −0.58]	<0.00001
Excluded high drop out rate (≤20%)	20	−1.16 [−1.73, −0.59]	<0.0001	13	−1.53 [−2.09, −0.97]	<0.00001

CI, confidence interval; SMD, standardized mean difference.