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Table 1 Response rates according to demographic and other factors. Response differed significantly for all factors shown ((p < 0.001)

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

   Total N Percentage (weighted) who responded
Age (years) at 01/01/05 <25 3,442 50
  25–29 3,347 58
  30–34 3,432 64
  35–39 3,173 67
  40–49 3,137 64
  50–60 631 69
Gender Male 15,585 60
  Female 1,577 67
Service Naval Service 2,943 57
  Army 10,936 61
  RAF 3,283 61
Rank Officer 2,718 70
  Rank 14,444 59
Status Reservist 2,987 53
  Regular 14,175 61
Deployment Era 9,627 58
  TELIC 1 7,535 63
Ethnic group* White 14,142 62
  Non-white 882 56
All addresses military Yes 12,705 70
  No 4,457 30
Military unit visited Yes 5,252 68
  No 11,910 57
  Total 17,162 60
  1. *Ethnic group was missing for 2456 personnel.