Comparison 7. Effects of school‐based asthma interventions vs usual care subgrouped by whether design included active inclusion or participation of parents.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Exacerbations leading to emergency department (ED) visits	13		Odds Ratio (Random, 95% CI)	0.70 [0.53, 0.92]
1.1 Parents actively included	8		Odds Ratio (Random, 95% CI)	0.82 [0.53, 1.25]
1.2 Not included/unclear	5		Odds Ratio (Random, 95% CI)	0.58 [0.42, 0.81]
2 Absence from school	10		Std. Mean Difference (Random, 95% CI)	‐0.07 [‐0.22, 0.08]
2.1 Parents actively included	7		Std. Mean Difference (Random, 95% CI)	‐0.02 [‐0.23, 0.18]
2.2 Not included/unclear	3		Std. Mean Difference (Random, 95% CI)	‐0.18 [‐0.50, 0.15]
3 Withdrawal from the study	13		Odds Ratio (Random, 95% CI)	1.14 [0.92, 1.43]
3.1 Parents actively included	9		Odds Ratio (Random, 95% CI)	1.21 [0.93, 1.58]
3.2 Not included/unclear	4		Odds Ratio (Random, 95% CI)	0.97 [0.62, 1.53]