Primary analysis: 8 trials with a total of 485 children.
Secondary analysis: 15 trials with a total of 734 children.
Primary analysis results:
average score effect size, -0.32 (95% CI: -0.54, -0.11, p<0.01; heterogeneity analysis result, H=0.96);
score q improved RR, 0.76 (95% CI: 0.60, 0.95, p=0.02; H=0.53);
hospitalisation RR, 0.85 (95% CI: 0.47, 1.53, p=0.58; H=0.56); and
oximetry effect size, 0.14 (95% CI: -0.04, 0.33, p=0.13; H<0.01).
Secondary analysis: the results were similar to the primary analysis, but some results were more heterogeneous.