Table 2.
Results of the partitioned proportional hazards model analysis for seven five year periods with coronary heart disease deaths as end point and six risk factors as covariates
| Follow up period | Deaths/ sample | Factor | Coefficient | T Value | Delta for computing hazard ratios | Hazards ratios | 95 % CI |
| Years 1–5 | 9/1622 | Age | 0.0229 | 0.32 | 5 years | 1.12 | 0.56 to 2.26 |
| Systolic blood pressure | 0.0096 | 0.63 | 20 mm Hg | 1.21 | 0.67 to 2.20 | ||
| Cholesterol | 0.8507 | 3.47 | 1 mmol/l | 2.34 | 1.45 to 3.79 | ||
| Physical activity | –0.1081 | –0.23 | 1 score unit | 0.90 | 0.36 to 2.25 | ||
| Body mass index | –0.0274 | –0.30 | 1 unit | 0.97 | 0.81 to 1.16 | ||
| Cigarettes | 0.0168 | 0.54 | 10 cigarettes | 1.18 | 0.64 to 2.18 | ||
| Years 6–10 | 16/1542 | Age | 0.1012 | 1.87 | 5 years | 1.66 | 0.98 to 2.82 |
| Systolic blood pressure | 0.0367 | 4.12 | 20 mm Hg | 2.08 | 1.47 to 2.95 | ||
| Cholesterol | 0.2630 | 1.15 | 1 mmol/l | 1.30 | 0.83 to 2.04 | ||
| Physical activity | –0.8927 | –2.89 | 1 score unit | 0.41 | 0.22 to 0.75 | ||
| Body mass index | –0.1085 | –1.49 | 1 unit | 0.90 | 0.78 to 1.03 | ||
| Cigarettes | –0.0126 | –0.43 | 10 cigarettes | 0.88 | 0.50 to 1.57 | ||
| Systolic blood pressure* | 0.0411 | 4.02 | 20 mm Hg | 2.27 | 1.53 to 3.39 | ||
| Cholesterol* | 0.4950 | 2.00 | 1 mmol/l | 1.64 | 1.01 to 2.06 | ||
| Years 11–15 | 28/1428 | Age | 0.1208 | 3.01 | 5 years | 1.83 | 1.23 to 2.71 |
| Systolic blood pressure | 0.0195 | 2.19 | 20 mm Hg | 1.48 | 1.04 to 2.09 | ||
| Cholesterol | 0.0193 | 0.11 | 1 mmol/l | 1.02 | 0.72 to 1.44 | ||
| Physical activity | –0.1201 | –0.42 | 1 score unit | 0.89 | 0.51 to 1.55 | ||
| Body mass index | 0.0173 | 0.33 | 1 unit | 1.02 | 0.92 to 1.13 | ||
| Cigarettes | 0.0669 | 3.75 | 10 cigarettes | 1.95 | 1.38 to 2.77 | ||
| Systolic blood pressure* | 0.0275 | 2.76 | 20 mm Hg | 1.53 | 1.18 to 2.56 | ||
| Cholesterol* | 0.0193 | 0.10 | 1 mmol/l | 1.02 | 0.69 to 1.50 | ||
| Years 16–20 | 33/1258 | Age | 0.0373 | 1.03 | 5 years | 1.20 | 0.84 to 1.72 |
| Systolic blood pressure | 0.0305 | 3.84 | 20 mm Hg | 1.84 | 1.35 to 2.51 | ||
| Cholesterol | 0.3171 | 2.01 | 1 mmol/l | 1.37 | 1.01 to 1.87 | ||
| Physical activity | –0.2389 | –0.96 | 1 score unit | 0.78 | 0.48 to 1.28 | ||
| Body mass index | –0.0047 | –0.09 | 1 unit | 1.00 | 0.90 to 1.10 | ||
| Cigarettes | –0.0072 | –0.36 | 10 cigarettes | 0.93 | 0.63 to 1.38 | ||
| Years 21–25 | 35/1063 | Age | 0.0657 | 1.88 | 5 years | 1.39 | 0.99 to 1.96 |
| Systolic blood pressure | 0.0045 | 0.47 | 20 mm Hg | 1.09 | 0.75 to 1.59 | ||
| Cholesterol | 0.1315 | 0.82 | 1 mmol/l | 1.14 | 0.83 to 1.56 | ||
| Physical activity | –0.2272 | –0.94 | 1 score unit, | 0.80 | 0.50 to 1.28 | ||
| Body mass index | 0.0785 | 1.62 | 1 unit | 1.08 | 0.98 to 1.19 | ||
| Cigarettes | 0.0300 | 1.86 | 10 cigarettes | 1.35 | 0.98 to 1.85 | ||
| Years 26–30 | 42/864 | Age | 0.0648 | 1.96 | 5 years | 1.38 | 1.00 to 1.91 |
| Systolic blood pressure | 0.0290 | 2.19 | 20 mm Hg | 1.79 | 1.06 to 3.00 | ||
| Cholesterol | 0.0075 | 2.09 | 1 mmol/l | 1.01 | 1.00 to 1.01 | ||
| Physical activity | –0.6464 | –3.17 | 1 score unit | 0.52 | 0.35 to 0.78 | ||
| Body mass index | –0.0069 | –0.15 | 1 unit | 0.99 | 0.91 to 1.09 | ||
| Cigarettes | 0.0302 | 2.06 | 10 cigarettes | 1.35 | 1.01 to 1.80 | ||
| Years 31–35 | 51/653 | Age | 0.1712 | 5.40 | 5 years | 2.35 | 1.72 to 3.21 |
| Systolic blood pressure | 0.0058 | 0.63 | 20 mm Hg | 1.12 | 0.78 to 1.61 | ||
| Cholesterol | 0.2591 | 1.97 | 1 mmol/l | 1.30 | 1.00 to 1.68 | ||
| Physical activity | –0.0869 | –0.36 | 1 score unit | 0.92 | 0.57 to 1.47 | ||
| Body mass index | –0.0054 | –0.11 | 1 unit | 0.99 | 0.90 to 1.10 | ||
| Cigarettes | 0.0061 | 0.39 | 10 cigarettes | 1.06 | 0.78 to 1.44 |
*Derived from independent models with estimates adjusted for specific risk factor changes.