To the Editor:
Indeed, self-report is not a perfect method to ascertain rheumatoid arthritis (RA) cases. RA is not a well-defined disease from the perspective of a lay person; therefore, underreporting and/or overreporting are very possible in health surveys1. The objective of our study was to highlight the issue of misclassification error, which is inherent in both self-report and health administrative data. Given the problems with estimating RA prevalence using a single source of information (including self-report), we provide an analytical approach to obtain …
Address correspondence to Dr. S. Bernatsky, Research Institute of the McGill University Health Centre, 5252 boul. de Maisonneuve Ouest, 3F.51 Montreal, Quebec H4A 3S5, Canada. E-mail: Sasha.bernatsky{at}mcgill.ca