Comparison 9. Effects of school‐based asthma interventions vs usual care subgrouped by configuration of conditions.

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 PI1 ‐ theory, not in own time, no substantial school nurse involvement	5		Odds Ratio (Random, 95% CI)	0.85 [0.47, 1.52]
1.2 PI2 ‐ theory, not individual, substantial school nurse involvement	0		Odds Ratio (Random, 95% CI)	0.0 [0.0, 0.0]
1.3 Other configuration	8		Odds Ratio (Random, 95% CI)	0.67 [0.47, 0.94]
2 Absence from school	10		Std. Mean Difference (Random, 95% CI)	‐0.07 [‐0.22, 0.08]
2.1 PI1 ‐ theory, not in own time, no substantial school nurse involvement	4		Std. Mean Difference (Random, 95% CI)	‐0.10 [‐0.46, 0.25]
2.2 PI2 ‐ theory, not individual, substantial school nurse involvement	0		Std. Mean Difference (Random, 95% CI)	0.0 [0.0, 0.0]
2.3 Other configuration	6		Std. Mean Difference (Random, 95% CI)	‐0.05 [‐0.21, 0.12]
3 Withdrawal from the study	13		Odds Ratio (Random, 95% CI)	1.14 [0.92, 1.43]
3.1 PI1 ‐ theory, not in own time, no substantial school nurse involvement	4		Odds Ratio (Random, 95% CI)	0.88 [0.55, 1.40]
3.2 PI2 ‐ theory, not individual, substantial school nurse involvement	1		Odds Ratio (Random, 95% CI)	5.67 [0.16, 195.90]
3.3 Other configuration	8		Odds Ratio (Random, 95% CI)	1.23 [0.95, 1.58]