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Table 3 Three, 12 and 24 month response rates

From: The effect of postal questionnaire burden on response rate and answer patterns following admission to intensive care: a randomised controlled trial

  3 months 12 months 24 months
  Group A Group B Group A Group B Group A Group B
Posted (n) 6112 5993 2548 2366 1752 1617
Response (n) 2466 2315 1873 1719 1527 1406
Response Rate (%) 40.3 38.6 73.5 72.7 87.2 87.0
Absolute difference (%) 1.7 0.9 0.2
95% CI 0.0 to 3.5 −1.7 to 3.4 −2.1 to 2.5
Relative Risk 1.03 1.03 1.02
95% CI 1.00 to 1.06 0.94 to 1.13 0.85 to 1.21
p 0.053 0.52 0.878