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Table 3 Distribution of patients and events according to different categorizations of the primary independent variable

From: Association of sleep disturbances within 4 weeks prior to incident acute myocardial infarction and long-term survival in male and female patients: an observational study from the MONICA/KORA Myocardial Infarction Registry

Frequency of sleep disturbances within 4 weeks prior to AMI Men (n = 2511) Women (n = 828)
No. per category (%) No. of deaths No. per category (%) No. of deaths
Original response never 1699 (67.7) 206 427 (51.6) 71
<  1 per week 247 (9.8) 40 82 (9.9) 14
once per week 67 (2.7) 10 31 (3.7) 7
>  1 per week 257 (10.2) 37 138 (16.7) 16
nightly 241 (9.6) 25 150 (18.1) 23
Categorization 1 never 1699 (67.7) 206 427 (516) 71
sometimes 571 (22.7) 87 251 (30.3) 37
nightly 241 (9.6) 25 150 (18.1) 23
Categorization 2 never 1699 (67.7) 206 427 (51.6) 71
occasionally 314 (12.5) 50 113 (13.7) 21
frequently 498 (19.8) 62 288 (34.8) 39
Binary (any time) no 1699 (67.7) 206 427 (51.6) 71
yes 812 (32.3) 112 401 (48.4) 60
  1. AMI acute myocardial infarction