Efficacy and Safety of Re Du Ning Injection for Acute Exacerbations of Chronic Obstructive Pulmonary Disease: A Systematic Review and Meta-Analysis

Table 2

Results of subgroup analysis.

Outcome	Course of treatment (days)	No. of studies	Effects within subgroups (95% CI)	Heterogeneity within subgroups	Interaction value
Response rate	≤7	9	RR 1.15 (1.09, 1.22)	; I^2 = 0%
	>7	14	RR 1.14 (1.07, 1.20)	; I^2 = 36%
C-reactive protein (mg/L)	≤7	4	MD −10.06 (−19.05, −1.07)	; I^2 = 94%
	>7	4	MD −3.48 (−5.33, −1.63)	; I^2 = 0%