Numbers needed to treat derived from meta-analyses--sometimes informative, usually misleading.
Smeeth
L
L
Department of Primary Care and Population Sciences, Royal Free and University College Medical School, University College London, London NW3 2PF.
Haines
A
A
Ebrahim
S
S
D002986:Clinical Trials as Topic; D003627:Data Interpretation, Statistical; D006801:Humans; D015201:Meta-Analysis as Topic; D017063:Outcome Assessment, Health Care; D018401:Sample Size