Table 2.

Cohort demographics and statistics for non-gated model.

Characteristic	Retrospective non-gated coronary CT Cohort								External non-gated validation cohorts
	Stanford				MESA				External non-gated validation cohorts
	Training	Validation	Test	Total	Training	Validation	Test	Total	Site 1	Site 2	Site 3	Site 4
Patient sex
M	87	11	24	122	67	11	21	99	22	53	46	61
F	64	11	18	93	59	11	24	94	0	22	25	74
N/A^a	0	0	0	0	37	1	1	39	0	0	0	0
No. of exams	151	22	42	215	163	23	46	232	22	75	71	135
Mean age (range [± standard deviation])	60.9 (18–80[±9.8])	60.6 (31–82[±12.1])	60.6 (47–73[±7.5])	60.8 (18–82[±9.6])	70.0 (54–111[±9.0])	65.0 (55–80[±7.3])	65.9 (55–91[±9.0])	67.8 (54–111[±9.0])	64.6 (38–76[±10.1]	62.4 (31–88[±13.3])	66.5 (43–83[±9.0])	N/A
Median time interval^b	8.0	8.2	3.3	6.2	0.0	0.0	0.0	0.0	2.7	1.0	5.6	2.4
Scanner
GE	55	9	20	84	40	40	0	0	22	39	0	131
Siemens	90	13	20	123	123	123	23	46	0	11	71	3
Other	6	0	2	8	0	0	0	0	0	25	0	1
CAC Score Bucket
I	59	12	18	89	48	6	7	61	4	22	28	52
II	12	5	3	20	12	3	4	19	1	4	4	11
III	35	3	5	43	38	3	14	55	3	17	13	22
IV	24	1	10	35	34	7	13	54	4	16	14	32
V	21	1	6	28	30	4	8	42	11	16	12	18

^aInformation was not available due to site specific patient privacy rules.

^bMedian time interval (months) between non-gated routine chest CT and gated coronary CT for each test set.