Table 1

Pre-existing CHD status and rates/1000 person-years, and age adjusted relative risk of CHD over 15 years’ cumulative follow up and by specific period of follow up

CHD status
None
(n = 5792)
Evidence but no doctor diagnosis(n = 1521)Doctor diagnosed
(n = 422)
Total 15 years’ cumulative follow up
Rate/1000 (n)7.0 (563)12.6 (249)38.8 (171)
Age adjusted RR (95% CI)1.0 1.7 (1.5 to 2.0)4.6 (3.8 to 5.5)
Specific period of follow up
0–5.0 years
 Number at risk 5792 1521 422
 Rate/1000 (n)5.1 (146)11.2 (82)38.4 (72)
 Age adjusted RR (95% CI)1.0 2.0 (1.6 to 2.7)5.9 (4.4 to 7.9)
5.1–10 years
 Number at risk1-150 5544 1404 331
 Rate/1000 (n)7.4 (199)13.9 (92)41.8 (60)
 Age adjusted RR (95% CI)1.01.7 (1.4 to 2.2)4.4 (3.3 to 6.0)
10.1–15 years
 Number at risk1-150 5182 1237 251
 Rate/1000 (n)8.8 (218)13.0 (75)35.8 (39)
 Age adjusted RR (95% CI)1.0 1.4 (1.1–1.8)3.5 (2.5–5.0)
  • 1-150 Men who died or developed major CHD before the specific follow up period were excluded.

  • MI, myocardial infarction; RR, relative risk; CI, confidence intervals.