Electronic medical records of one country, population gender mix not given
Estimation of CRPS 1 incidence from data of 600 000 patients; control groups are those who do not develop CRPS 1
Acknowledgment of funding provided through TREND, a Dutch government research grant; no mention of conflict of interests
Potentially overstrict retrospective application of 3 sets of criteria: Veldman, IASP, and Harden/Bruehl, to electronic records by independent reviewers with statistics for agreement
Poisson distribution, logistic regression, chi-square, and Student’s -tests using SPSS software
Electronic medical records of one region, population gender mix not given
Estimation of CRPS 1 incidence from data of 70 745 patients
Acknowledgment of funding provided through two sources, no conflict of interests mentioned
Potentially lenient retrospective application of IASP criteria to electronic records by one reviewer with 10% random independent assessment and 93.4% agreement
Chi-square, Fisher’s exact, and Wilcoxon rank sum tests with no software described