International comparability of patient safety indicators in 15 OECD member countries: a methodological approach of adjustment by secondary diagnoses.
Drösler SE, Romano PS, Tancredi DJ, et al. International comparability of patient safety indicators in 15 OECD member countries: a methodological approach of adjustment by secondary diagnoses. Health Serv Res. 2012;47(1 Pt 1):275-92. doi:10.1111/j.1475-6773.2011.01290.x.
This study demonstrates that considerable adjustment is necessary in order to use the Patient Safety Indicators as a valid means of comparing patient safety across countries.