rOASI population No studies Index OASI rate (%) rOASI rate (%) rOASI range %
All studies 49 3.31 6.6 1.9-25%
National/state database 12 4.34 5.59 2.1-7.2%
Teaching/university hospital 32 6.13 6.02 1.9-13.4%
District general hospital 6 3.2 11.74 6.66-25%