|Variable||Response Level||Acceleration Factor (95% CI)||p Value|
|Distal anastomosis diameter||≤2.0 mm||Reference||<0.001|
|>2.0 mm||47.66 (18.91–120.15)|
|Age||Per 10 yrs||1.84 (1.35–2.51)||<0.001|
|Cholesterol||Per 50 mg/dl||0.76 (0.60–0.96)||0.022|
|Canadian Functional Class||I||Reference||0.058|
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 increase in 10 years of age, there is a 1.84 increase in the time to graft occlusion. Thus, if a 50-year old man will occlude his graft at 5 years, then a 60-year old man will occlude his graft at 1.84 × 5 or 9.2 years, all other variables being equal.
CI = confidence interval; SVG = saphenous vein graft.