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Table 2 Demographic characteristics of patient sample by level of study participation with P value for tests of variation across the three groups

From: Test–retest stability of patient experience items derived from the national GP patient survey

  Patients sent but not returning a test questionnaire within 3 weeks of mail out.a Patients sent but not returning a retest questionnaire within 4 weeks of mail out. Patients returning both a test and a retest questionnaire within the deadlines. P value
Number 2009 249 348 n/a
Number (%) male 807 (40.1) 89 (35.7) 138 (39.7) 0.404
Number (%) white Britisha 404 (88.0) 204 (89.1) 326 (95.6) 0.001
Mean (SD) age in years 46.2 (18.5) 59.4 (18.8) 65.3 (15.1) <0.001
  1. aEthnicity data was only available for those who returned a completed test questionnaire and responded to the ethnicity item. For patients sent but not returning a test questionnaire within 3 weeks of mail out, n = 473; for patients sent but not returning a retest questionnaire within 4 weeks of mail out, n = 229; for patients returning both a test and a retest questionnaire within the deadlines, n = 341