Files in this Data Supplement:

• Appendix Table 1 - Study Characteristics of Univariate Studies of Clinical Risk Factors

• Appendix Table 2 - Study Characteristics of Multivariate Studies of Clinical Predictors

• Appendix Table 3 - Significant Clinical Predictors in Multivariate Studies

• Appendix Table 4 - Detailed Results of Univariate Studies on the Influence of Age on Postoperative Pulmonary Complication Rates

• Appendix Table 5 - Detailed Results of Univariate Studies of the Influence of American Society of Anesthesiologists' Class on Postoperative Pulmonary Complication Rates

• Appendix Table 6 - Detailed Results of Univariate Studies of the Influence of Obesity and Diabetes on Postoperative Pulmonary Complication Rates

• Appendix Table 7 - Detailed Results of Univariate Postoperative Pulmonary Complication Rates Stratified by Surgical Site

• Appendix Table 8 - Characteristics of Studies of Laboratory Predictors