Skip to main content

Table 2 Main result: ITT-analyses of response rates

From: Pre-contact by telephone increases response rates to postal questionnaires in a population of stroke patients: an open ended randomized controlled trial

  1. Outcome (45 day RR.) 2. Outcome (365 day RR.)
  Resp Non-Resp Total RR Resp Non-Resp Total RR
IG 45 60a 105 42.9 % 48 57 105 45.7 %
CG 30 82 112 26.8 % 32 80 112 28.6 %
Total 75 142 217b   80 137 217  
Test p OR [95 % CI]: ΔRR p OR [95 % CI]: ΔRR
Mid-p 0.014 2.040 [1.157, 3.639] 16.1 % 0.009 2.095 [1.197,3.707] 17.1 %
Fisher’s 0.015     0.011    
χ 2 0.013     0.009    
  1. The table contains the 2x2-contingency tables w.r.t. 1. and 2. outcomes, with total figures for respondents (Resp) and non-respondents (Non-Resp) in the intervention- and control groups. Response rates (RR) for the two study arms are also provided. Below the contingency tables we report the OR with 95 % CI’s, the absolute difference in response rates (ΔRR), and the p-values from three standard 2-sided tests for effect provided by the oddsratio-function from the epitools-package for R (CI’s are computed w.r.t. the mid-p value)
  2. aIncludes the 5 respondents who were successfully contacted, but refused participation in the questionnaire study
  3. bOriginally 235 patients were included; 10 patients (7 from the IG and 3 from the CG) died before it was time to send them a questionnaire; 6 (3 in the IG and 3 in the CG) were discovered to be demented; 1 IG patient was discovered to have been mis-diagnosed with stroke, and one CG patient was discovered to have been mis-assessed as eligible. These 18 were excluded prior to analysis