Table 3.

Univariate logistic regression analysis and ROC curve analysis for prediction of LCx STEMI-equivalent ACS.

	Univariate logistic regression			ROC curve analysis
	OR	95% CI	p ∗∗∗	AUC	95% CI	Sensitivity (%)	Specificity (%)	Accuracy (%)
sV7-9 STE	19.0	5.6–63.9	<0.001	0.71	0.58–0.84	46.7	95.6	92.2
V1-3 STD	2.9	0.8–11.5	0.122	0.56	0.45–0.67	20.0	92.6	87.7
Age, years	1.0	1.0–1.0	0.645	0.51	0.34–0.68	46.7	64.7	65.8
Woman	1.7	0.5–5.6	0.388	0.55	0.43–0.66	26.7	82.4	78.5
Left ventricular EF, %	1.0	1.0–1.1	0.475	0.57	0.44–0.71	60.0	61.8	63.5
Killip 1	1.8	0.2–14.2	0.586	0.52	0.45–0.59	93.3	11.3	16.9
GRACE score∗	1.0	0.8–1.1	0.474	0.56	0.39–0.73	53.3	64.7	63.9
TIMI score	0.64	0.4–1.1	0.077	0.59	0.45–0.74	40.0	68.1	64.4
hs-cTnI on admission∗∗	1.1	1.0–1.1	0.070	0.65	0.50–0.80	80.0	48.0	60.7

Numbers are calculated based on univariate linear regression and receiver-operation characteristics (ROC) curve analysis. The cut-off point in the ROC curve analysis for calculation of sensitivity, specificity, and accuracy was defined as the value with the highest sum of sensitivity and specificity. Variables included the presence of sV7-9 STE (yes/no), V1-3 STD (yes/no), age (continuous), sex (man or woman), left ventricular ejection fraction (continuous), Killip grade (1 or other), GRACE score (^∗per 10 unit, continuous), and hs-cTnI on admission (^∗∗per 1000 ng/L, continuous). p-value threshold was 0.006 after the Bonferroni correction. sV7-9, synthesized V7-9; STE, ST-segment elevation; STD, ST-segment depression; LCx, left circumflex coronary artery; EF, ejection fraction; GRACE, Global Registry of Acute Coronary Events; TIMI, thrombolysis in myocardial infarction; hs-cTnI, cardiac troponin I; OR, odds ratio; CI, confidence interval; ROC, receiver operating characteristics; AUC, the area under the curve.