Comparison 2. Subgroup: One‐off steroid use vs longer course of steroids.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Coronary artery abnormalities	6	729	Odds Ratio (M‐H, Fixed, 95% CI)	0.30 [0.18, 0.50]
1.1 One‐off steroid use	3	277	Odds Ratio (M‐H, Fixed, 95% CI)	0.56 [0.29, 1.08]
1.2 Longer course of steroids	3	452	Odds Ratio (M‐H, Fixed, 95% CI)	0.13 [0.05, 0.32]