Table A1.

Analysis of differences between malignant and benign nodules. Student’s t and Mann–Whitney U * analyses. Thresholds, sensitivity, specificity, and AUCs are based on the ROC curves for each keV energy level in AP.

Parameter keV (AP)	Malignant (n = 46)		Benign (n = 19)		p-Value	Thresholds	Sensitivity (%)	Specificity (%)	AUC
	Mean * Median	SD * Range	Mean * Median	SD * Range
40	* 154.76	* 77.17–399.58	* 104.56	* 70.07–178.5	0.001	134.10	72	74	0.761
45	* 129.46	* 63.48–317.39	* 85.80	* 59.65–142.52	<0.001	106.08	74	74	0.783
50	* 109.70	* 52.36–251.17	* 68.42	* 51.26–113.57	<0.001	84.19	76	74	0.800
55	* 94.93	* 43.86–200.01	* 59.34	* 44.54–92.55	<0.001	93.99	54	100	0.827
60	* 80.87	* 35.33–151.58	* 47.61	* 35.25–75.57	<0.001	52.32	84	79	0.849
65	* 65.92	* 28.62–116.34	* 35.60	* 26.69–65.39	<0.001	53.99	70	95	0.852
70	* 59.16	* 25.78–95.00	* 32.67	* 21.19–57.62	<0.001	48.32	67	94	0.855
75	50.27	14.46	30.96	10.14	<0.001	43.38	67	94	0.851
80	45.83	12.87	28.03	10.30	<0.001	40.02	70	89	0.849
85	42.10	12.16	25.08	10.45	<0.001	38.51	67	95	0.854
90	38.13	11.47	22.04	10.58	<0.001	36.66	65	95	0.846
95	34.64	11.14	19.61	10.84	<0.001	32.32	65	89	0.824
100	32.23	11.00	17.66	11.10	<0.001	28.70	67	84	0.823
105	30.08	10.98	16.05	11.34	<0.001	27.83	60	89	0.811
110	28.06	11.04	14.54	11.59	<0.001	26.76	59	89	0.800
115	26.56	11.13	13.42	11.78	<0.001	23.31	63	84	0.791
120	25.14	11.25	12.37	11.97	<0.001	26.29	52	94	0.776
125	23.91	11.38	11.79	11.82	<0.001	26.25	50	95	0.768
130	22.89	11.52	10.69	12.30	<0.001	25.14	50	95	0.761
135	21.91	11.65	9.96	12.45	<0.001	23.39	52	95	0.757
140	21,3	11,98	9,45	12,47	<0.001	22.95	52	95	0.752

* non-normal distribution.