Table 1: Comparison of the historical study sample ( 𝑛 = 8 3 9 ) with the rest of the Kuopio Ischaemic Risk Factor study (KIHD) cohort ( 𝑛 = 1 4 7 2 ).

CovariatesMean (SD) or proportion (%)
Historical study sample ( 𝑛 = 8 3 9 )The rest of the KIHD cohort ( 𝑛 = 1 4 7 2 ) 𝑃 values for the difference between groups

Age group (%)
 (1) (42 years)24.76.7<0.001
 (2) (48 years)19.910.0
 (3) (54 years)44.866.4
 (4) (60 years)10.616.9
Educational level (%)
 (1) less than elementary7.511.1<0.001
 (2) elementary42.649.5
 (3) full or some secondary42.831.9
 (4) high school or above7.27.4
Occupational level (%)
 (1) farmer11.717.8<0.001
 (2) blue collar45.842.1
 (3) white collar42.640.2
Smoking history (pack/years)163.7 (299.6)200.7 (377.2)0.011
BMI (kg/m2)26.8 (3.6)26.9 (3.5)0.604
LDL cholesterol (mmol/L)4.0 (1.0)4.1 (1.0)0.008
HDL cholesterol (mmol/L)1.3 (0.3)1.3 (0.3)0.424
SBP (mm Hg)133.5 (16.3)134.5 (17.1)0.198
Leisure time physical activity (h/year)123.5 (153.8)106.7 (129.7)0.008
Alcohol consumption (g/week)92.7 (151.7)85.9 (139.2)0.281
Income (marks/year)83,983.2 (54174.6)77,512.3 (52398.8)0.005

BMI: body mass index; LDL: low density lipoprotein; HDL: high density lipoprotein; SBP: systolic blood pressure.