Table 3

Predicted Probability of Recruitable and Spontaneously Visible Collateral Vessels and 95% Confidence Intervals

NitratesLp Value95% CI
Angina <3 mo
 Used−1.710.150.1–0.21
 Not used−0.510.380.28–0.48
Angina ≥3 mo
 Used0.790.670.59–0.74
 Not used1.990.880.81–0.92

CI = confidence interval; L = logit of the probability.