Fig. 2From: Good validity in the Norwegian Knee Ligament Register: assessment of data quality for key variables in primary and revision cruciate ligament reconstructions from 2004 to 2013Positive predictive values for investigated variables in primary and revision reconstructions. A Positive predictive values for variables in primary reconstructions. B Positive predictive values for variables in revision reconstructions. Abbreviations: ACL, anterior cruciate ligament; OP, operationBack to article page