|Variable||Response Level||Acceleration Factor (95% CI)||p Value|
|Distal anastomosis diameter||≤2.0 mm||Reference||<0.001|
|>2.0 mm||6.78 (3.86–11.89)|
|Age||Per 10 years||1.28 (1.04–1.58)||0.021|
|Cholesterol||Per 50 mg/dl||0.82 (0.69–0.98)||0.031|
|Platelet count||Per 100,000||0.82 (0.66–1.01)||0.069|
For each variable, the acceleration factor represents the change in time to graft occlusion for the increment noted. An acceleration factor >1.0 means that an increase in the value of the associated variable leads to an increase in the length of time to graft occlusion; an acceleration factor <1.0 means that an increase in the value of the associated variable leads to a decrease in the time to graft occlusion. For example, adjusting for all other variables, for every 50-mg/dl increase in cholesterol, there is a decrease in the time to graft occlusion by a factor of 0.82. Thus, if a man with a serum cholesterol level of 200 mg/dl will occlude his graft at 5 years, then a man with a serum cholesterol level of 250 mg/dl will occlude his graft at 0.82 × 5 or 4.1 years, all other variables being equal.
IMA = internal mammary artery; other abbreviations as in Table 4.