A smoking cessation programme (SCP) plus inhaled ipratropium or inhaler placebo v usual care (UC) in current smokers with asymptomatic airway obstruction at 14.5 years*

OutcomeComparisonsEvent ratesRRR (95% CI)NNT (CI)
*Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article.
All cause mortalitySCP (with or without iprotropium) v UC11.8% v 13.7%14.5% (1.6 to 25.7)51 (26 to 487)
SCP plus ipratropium v UC11.5% v 13.7%16.2% (1.1 to 28.9)45 (24 to 695)
SCP plus placebo v UC12.0% v 13.7%12.9% (−2.6 to 26.0)Not significant
SCP plus ipratropium v SCP plus placebo11.5% v 12.0%3.8% (−14.2 to 18.9)Not significant