Table 2

 Distribution of cases of CHD by education in the whole KIHD population and a low risk subset of the KIHD population

Whole population (n = 2682)Number (%)Number of cases (%)Risk per 1000(95% CI)Crude relative risk*†(95% CI)Excess risk† (per 1000)(95% CI)
*Crude relative risk is calculated directly from this cross tabulation and so is slightly different from the RH of 1.90 mentioned above, which is model based and accounts for survival time. †Compared with the highest education category. All confidence intervals for simple risk calculations and risk differences are asymptotic 95% CI. All confidence intervals for relative risks are Mantel-Haenszel 95% CI.
Education
< Primary school1121 (41.8)218 (51.3)194 (171, 218)1.83 (1.36, 2.47)88 (51, 125)
Some high school1128 (42.1)161 (37.9)143 (122, 163)1.35 (0.99, 1.83)37 (1, 72)
High school graduate433 (16.1)46 (10.8)106 (77, 135)1.00
Total2682425158
Low risk population (n = 404, 15.1%)
Education
< Primary school122 (30.2)8 (34.8)66 (22, 109)1.61 (0.50, 5.18)25 (−34, 84)
Some high school184 (45.5)11 (47.8)60 (26, 94)1.46 (0.48, 4.48)19 (−33, 71)
High school graduate98 (24.3)4 (17.4)41 (2, 80)1.00
Total4042357