Year of training* | Threshold ACR score†| OR‡ | 95% CI for OR | 100 × [OR −1] (%) § | ACR 50** | 95% CI for ACR 50 |
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PGY2 | 32 | 0.91 (P=0.0068) | [0.84, 0.97] | −9.3 | 4 | [0, 13] |
PGY3 | 42 | 0.93 (P=0.0014) | [0.89, 0.97] | −6.8 | 4 | [0, 15] |
PGY4 | 63 | 0.94 (P=0.0091) | [0.90, 0.98] | −6.0 | 8 | [0, 23] |
PGY5 | 47 | 0.93 (P=0.0039) | [0.88, 0.98] | −7.3 | 8 | [0, 20] |
- PGY=post graduate year, ACR=American college of radiology, OR=odds ratio, CI=confidence interval.
- * PGY2 is the first year of 4 consecutive years of radiology-specific specialty training.
- †Threshold ACR score at or above which point there is a negligible risk of exam failure. Estimated from the ROC curves.
- ‡ Odds ratios were calculated using logistic regression. Statistical significance at P ≤ 0.05.
- § 100 × [OR-1] is a formula that gives the percentage change in the odds of failing for every 1 unit increase in the ACR score. A negative value, as in this case, indicates the odds of failing decrease with increases in the ACR score.
- ** ACR 50 is the ACR score at which point there was a 50% chance of failure. This was estimated for each year of training using the logistic regression curves.