|Outcome||Number of trials (n)||MDI + VHC||Nebuliser||RRR (95% CI)||NNT (CI)|
|*Abbreviations defined in glossary; RRR, NNT, and CI calculated from control event rate and odds ratio and CI reported in article.|
|Hospital admission||6 (491)||11%||22%||52% (23 to 71)||9 (7 to 20)|
Review: β agonist delivery by metered dose inhaler with a valved holding chamber (compared with a nebuliser) reduces admissions in preschool children and infants with acute asthma or wheezing
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