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Table 3: 
Prevalence of features for each level of CAS
1 2 3 4
Training set (n = 196) 
    No. 16 90 42 48
    Calcification (%) 12.5 80.0 78.6 72.9
    LRNC (%) 0.0 30.0 100.0 100.0
    IPH (%) 0.0 1.1 28.6 70.8
Fibrous cap status 
    Thick (%) 0.0 21.1 (66.7)^a 23.8 12.5
    Thin (%) 0.0 10.0 (33.3)^a 69.1 64.6
    Ruptured (%) 0.0 0.0 7.1 22.9
Testing Set (n = 138) 
    No. 17 62 34 25
    Calcification (%) 17.6 83.9 79.4 80.0
    LRNC (%) 11.8 43.5 100.0 100.0
    IPH (%) 0.0 0.0 29.4 68.0
Fibrous cap status 
    Thick (%) 11.8 (100.0)^a 30.7 (66.7)^a 29.4 4.0
    Thin (%) 0.0 14.5 (33.3)^a 64.7 44.0
    Ruptured (%) 0.0 0.0 5.9 52.0

a Lesions with an LRNC.

	1	2	3	4
Training set (n = 196)
No.	16	90	42	48
Calcification (%)	12.5	80.0	78.6	72.9
LRNC (%)	0.0	30.0	100.0	100.0
IPH (%)	0.0	1.1	28.6	70.8
Fibrous cap status
Thick (%)	0.0	21.1 (66.7)^a	23.8	12.5
Thin (%)	0.0	10.0 (33.3)^a	69.1	64.6
Ruptured (%)	0.0	0.0	7.1	22.9
Testing Set (n = 138)
No.	17	62	34	25
Calcification (%)	17.6	83.9	79.4	80.0
LRNC (%)	11.8	43.5	100.0	100.0
IPH (%)	0.0	0.0	29.4	68.0
Fibrous cap status
Thick (%)	11.8 (100.0)^a	30.7 (66.7)^a	29.4	4.0
Thin (%)	0.0	14.5 (33.3)^a	64.7	44.0
Ruptured (%)	0.0	0.0	5.9	52.0