Figure 2. Absolute Differences of Postoperative Respiratory Complications in Prespecified Subgroups.

Sizes of data markers are proportional to the numbers of patients entering the analysis. P values are for the interaction between the subgroup and the treatment group. Lack of a significant interaction implies that the results are consistent across subgroups and that the overall effects estimated are the most appropriate estimates of treatment effect within each subgroup.

^aCalculated as weight in kilograms divided by height in meters squared.

^bRisk of complications is defined according to the Assess Respiratory Risk in Surgical Patients in Catalonia score as higher (≥26) or lower (<26).