Comparison 1. Inhaled salbutamol versus placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Serum potassium	4		Mean Difference (IV, Random, 95% CI)	Subtotals only
1.1 0 minutes	4	94	Mean Difference (IV, Random, 95% CI)	‐0.00 [‐0.19, 0.19]
1.2 1 minute	1	34	Mean Difference (IV, Random, 95% CI)	0.12 [‐0.08, 0.32]
1.3 3 minutes	1	34	Mean Difference (IV, Random, 95% CI)	0.0 [‐0.24, 0.24]
1.4 5 minutes	1	34	Mean Difference (IV, Random, 95% CI)	‐0.10 [‐0.34, 0.14]
1.5 10 minutes	1	34	Mean Difference (IV, Random, 95% CI)	‐0.18 [‐0.42, 0.06]
1.6 15 minutes	1	16	Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
1.7 30 minutes	4	88	Mean Difference (IV, Random, 95% CI)	‐0.27 [‐0.47, ‐0.08]
1.8 45 minutes	1	16	Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
1.9 60 minutes	4	88	Mean Difference (IV, Random, 95% CI)	‐0.41 [‐0.66, ‐0.17]
1.10 90 minutes	2	38	Mean Difference (IV, Random, 95% CI)	‐0.50 [‐0.79, ‐0.21]
1.11 120 minutes	1	20	Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]