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Table 3 Cumulative observed relative risks* and 95% confidence intervals for health outcomes over response wave.

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

Outcome

Number of contacts

 

1

2

3

4+ (all)**

Symptoms >17

1.24

1.09, 1.42

1.23

1.09, 1.39

1.21

1.08, 1.36

1.22

1.09, 1.36

PTSD

1.12

0.89, 1.43

1.15

0.93, 1.41

1.13

0.92, 1.38

1.09

0.89, 1.33

N

7384

 

9035

 

9793

 

10234

 
  1. Estimates are weighted to allow for oversampling of reservists.
  2. *Adjusted for age, sex, rank, service type, and reservist status.
  3. **These estimates are slightly different from those reported in [12] because we use relative risks rather than odds ratios, and also because we have excluded any confounders that were likely to be misclassified which could cause extra bias.
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BMC Medical Research Methodology

ISSN: 1471-2288

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