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Table 2 Electrocardiographic abnormalities (ECGA) of the 977 cohort participants, men aged 45–50, in 1993 (baseline) and at follow up in 1998

From: Prospective associations between ECG abnormalities and death or myocardial infarction in a cohort of 980 employed, middle-aged Swedish men

  ECG 1998
ECG 1993 ECGA no ECGA yes Missing Total
ECGA no 790 29 72 891
ECGA yes 19 15 7 41
Missing 36 9 (23)a 45
Total 845 53 79 977 (1000)b
  1. Classification of ECG outcomes
  2. The 977 participants were classified into three ECG categories as follows: ECG category 0, ECG performed in 1993 and 1998, no ECGA, (n = 790); ECG category 1, ECG performed in 1993 and/or 1998, one or more abnormalities (n = 79); and ECG category 9, ECG performed in 1993 or 1998 without abnormality (n = 108)
  3. a23 non-informative
  4. b1000-23 informative