Table 1. Demographic variables across status of colonoscopy rechecking (n = 56).

	Total		Unused		Used		p (χ2test)
	n = 56	% (=Yes)	n = 35	% (Yes)	n = 21	% (=Yes)
Age (years)
40–65	30	53.6	17	56.7	13	43.3	.33
65–81	26	46.4	18	69.2	8	30.8
Sex
Male	41	73.2	23	56.1	18	43.9	.10
Female	15	26.8	12	80.0	3	20.0
Marital status
Married	45	80.4	27	60.0	18	40.0	.42
Unmarried	10	17.9	7	70.0	3	30.0
No information	1	1.8
Education status
Up to high school	38	67.9	28	73.7	10	26.3	.005
Postsecondary	16	28.6	5	31.3	11	68.8
No information	2	3.6
Employed
Unemployed	28	50.0	19		9		.25
Employed	27	48.2	15		12
No	1	1.8
Household incomea
Up to 3000	25	44.6	19		6		.15
3000–7000	18	32.1	9	50.0	9	50.0
>7000	10	17.9	5	50.0	5
No information	3	5.4
Familial history of CRC
No	39	69.6	24	68.6	15	71.4	.82
Yes	17	30.4	11	31.4	6	28.6
History of having colonoscopy
No	28	50.0	18	51.4	10	47.6	.78
Yes	28	50.0	17	48.6	11	52.4
Maximum size of polypsb
<5 mm	26	46.4	15	57.7	11	42.3	.58
5–10 mm	12	21.2	7	58.3	5	41.7
>11 mm	18	32.1	13	72.2	5	27.8
Result of colonoscopy
Polypectomy/no polyps	15	26.8	12	80.0	3	20.0	.07
Polypectomy/remaining polyp	28	50.0	18	64.3	10	35.7
Not Polypectomy/remaining polyp	13	23.2	5	38.5	8	61.5

^aAMOUNT (UNIT: JPY1000).

^bThese polyps included removed or remaining polyps.