Table 3

Importance of each factor in deciding whether or not to perform coronary angiography

Group 1Group 2
Order of importanceFactorExplained deviance%*p Value†Order of importanceFactorExplained deviance%*p Value†
1.Troponin48.9%≤0.0011.Troponin49.6%≤0.001
2.ECG17.9%≤0.0012.Renal function14.9%≤0.001
3.Renal function11.8%≤0.0013.Risk score outcome14.3%∞0.02
4.Age9.5%≤0.0014.ECG9.8%≤0.001
5.Persistent chest pain6.4%≤0.0015.Persistent chest pain6.7%≤0.001
6.Previous CAD2.9%≤0.0016.Risk factors0.7%0.45
7.Risk factors0.5%0.437.Age0.6%∞0.50
8.Risk score outcomeNANA8.Previous CAD0.0%0.75
(Blocks)‡(2.1%)–(Blocks)‡(3.4%)–
Total100%Total100%

  • *Loglikelihood from a single attribute divided by the sum of partial loglikelihoods of all factors.

  • †p Value based on the loglikelihood test. ∞Factor risk score outcome is partially confounded by factor age, and therefore its impact cannot be interpreted.

  • ‡Explained deviance due to the allocation of cardiologists to blocks in the experimental design.

  • CAD, coronary artery disease; NA, not applicable.