Forest plot of effect estimates of statins for ORs, HRs and RRs. RR = Risk ratio, HR = Hazard ratio, OR = Odds Ratio. Where available, adjusted estimates (OR, HR, RR) were used. Values less than 1 indicate a better outcome with statin therapy. Box size is proportional to precision of the estimate. * Mortality was only given for the whole cohort, which included 24% patients with restrictive rather than obstructive spirometry finding. ** 10-year mortality (mortality at 30 days not shown).