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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.