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Table 1 Baseline characteristics of respondents and non-respondents

From: Association of changes in health-related quality of life in coronary heart disease with coronary procedures and sociodemographic characteristics

  I. Total II. Non-respondents at 6 weeks III. Respondents at 6 weeksa IV. Respondents at 6 weeks & 2 yearsa Comparison Column IV and total nonresponse (P-value) Comparison Column IV and nonresponse at 6 weeks (P-value)
  N = 1534 N = 475 N = 700 N = 344   
Age, mean (SD) 69 (12) 71 (12) 65 (11) 64 (10) <0.001 0.001
Gender (% women) 34 44 29 27 0.001 0.2
> 10 years education (%)    44 49   0.014
> 1 diagnosis (%) 65 72 60 56 0.001 0.039
Emergency admission (%) 70 80 62 58 <0.001 0.07
Acute Coronary Syndrome (%) 31 32 28 26 0.047 0.4
Invasive Coronary Procedure (%) 33 22 40 43 <0.001 0.06
Teaching Hospital (%) 54 48 57 59   
Central Hospital (%) 26 27 25 22 0.042 0.123
Local Hospital (%) 20 25 18 19   
  1. a Respondents to all multi-item scales of the SF-36