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Table 5 Simulated true and cumulative relative risks (RR's) for TELIC 1/Era that would be observed at each wave if the misclassification rates correspond to the percentage of discrepancies* and the relative risks and the prevalence rates correspond to those observed for multiple physical symptoms and PTSD

From: How many mailouts? Could attempts to increase the response rate in the Iraq war cohort study be counterproductive?

Prevalence (%) True RR Simulated cumulative 'observed' relative risks
Observed True      
    Wave 1 Wave 2 Wave 3 Wave 4+ (observed)
Multiple Symptoms       
10.84 6 3.05 1.26 1.26 1.24 1.22
  8 2.15 1.24 1.24 1.23 1.22
  10 1.83 1.24 1.24 1.23 1.22
  12 1.65 1.24 1.24 1.23 1.22
  14 1.52 1.23 1.23 1.23 1.22
  16 1.44 1.23 1.23 1.22 1.22
PTSD       
3.9 11 1.9 1.13 1.13 1.11 1.09
  12 1.40 1.11 1.11 1.10 1.09
  13 1.25 1.10 1.10 1.09 1.09
  1. *Simulations are based on the cumulative percent misclassification of 12.84, 12.85, 13.07, 13.22, i.e. the cumulative percentages of discrepant 2.