Early detection of colorectal cancer based on circular DNA and common clinical detection indicators

Table 1 General clinical characteristics of study subjects

Clinical features	Model building		Model validation
	CRC (n = 101)	CRP (n = 59)	CRC (n = 62)	CRP (n = 30)
Age
Average	58	56	57	57
Range	29-81	31-76	33-74	35-69
Sex
Male	60	34	37	19
Female	41	25	25	11
Location
Ascending colon	21		17
Descending colon	15		12
Transverse colon	3		4
Sigmoid colon	59		28
Rectal	3		1
Differentiation
Well	21		15
Moderate	57		33
Poorly	23		14
TNM stage
T1	11		11
T2	27		21
T3	44		7
T4	19		23

CRP: Colorectal polyps; CRC: Colorectal cancer; TNM: Tumor node metastasis.