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Table 3 AECOPD per person year by study group

From: Effect of beta-blockers on exacerbation rate and lung function in chronic obstructive pulmonary disease (COPD)

Statcope N Exacerbation rate per person-year (95% CI)
 +BB 63 1.14 (0.81,1.46)
 −BB 625 1.34 (1.22,1.46)
Macro
 +BB 107 1.72 (1.37,2.08)
 −BB 424 1.71 (1.53,1.88)