Table 7. Assessing the association between disease stage and carcinoembryonic antigen (CEA) level at diagnosis in colorectal cancer patients (Example 3).

	CEA ≤5 ng/mL			5< CEA ≤20 ng/mL			CEA >20 ng/mL
	Count	Percentage (%)		Count	Percentage (%)		Count	Percentage (%)
Stage I (n=235)	207	88		24	10		4	2
Stage II (n=578)	406	70		120	21		52	9
Stage III (n=448)	293	65		104	23		51	11
Stage IV (n=16)	1	6		4	25		11	69