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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.