Predictors of colonoscopy use one year after colonoscopy: prospective study of surveillance behavior for colorectal cancer

Figures & data

Figure 1. Flow diagram of study participants.

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

	Total		Unused		Used		p (χ^2test)
	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 income^a
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 polyps^b
<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.

Table 2. Comparison of psychological variables and follow-up colonoscopy.

	Unused (n = 35)		Used (n = 21)		p
	Mean	SD	Mean	SD
Physician recommendation	3.26	1.12	3.90	0.94	.01
Suffering colonoscopy	2.85	1.43	2.90	1.48	.96
Physician satisfaction	4.31	1.11	4.10	1.48	.78
CRC knowledge	6.09	3.364	7.33	2.799	.16
CRC worry	11.86	3.327	11.71	4.268	.83
Perceived preventability (0–100%)	49.71	23.33	55.71	30.09	.28
Perceived risk (0–100%)	43.71	18.80	54.76	28.22	.14
Perceive risk (each item)
I think the risk of CRC is high	3.06	0.998	3.48	1.078	.16
Compared with average women of the same age, morbidity of CRC is high	3.03	0.954	2.67	1.017	.19
Compared with average men of the same age, morbidity of CRC is low^a	3.29	0.987	3.19	1.123	.68
Recovery from CRC is easier compared with other diseases^a	3.14	1.089	2.81	1.209	.21
If I suffer from colon cancer, I will not completely heal from it	2.74	0.852	2.67	0.913	.72

^aThe item's score was reversed before analysis.

Table 3. Multiple logistic regression analysis of colonoscopy after one year^a

Variables	OR	95% CI
CRC worry	–	–
Perceived preventability (0–100%)	–	–
Perceived risk (0–100%)	–	–
Educational status (postsecondary)	7.10	1.83–27.56
Result of colonoscopy (not polypectomy/remaining polyp)	4.26	1.02–17.84

^aAdjusted: sex, household income, and physician recommendation.

Figure 2. Flow chart showing detection of polyps and their removal on colonoscopy. The numbers in each category are the rate of repeat colonoscopy use one year after initial colonoscopy.

Table 4. Comparison of psychological variables on follow-up colonoscopy.

Variables	Polypectomy/no polyps (N = 15)		Polypectomy/remaining polyps (N = 28)		Not Polypectomy/remaining polyps (N = 13)		p
	Mean	SD	Mean	SD	Mean	SD
CRC worry	11.27	3.17	13.11	3.98	9.62	2.22	.012
Perceived risk (0–100%)	47.33	14.86	44.64	24.42	55.38	27.87	.603
Perceived preventability (0–100%)	46.67	21.27	53.57	25.71	54.62	32.05	.681
Perceive risk (each item)
I think the risk of CRC is high	3.13	1.19	3.32	0.91	3.08	1.19	.690
Compared with average women of the same age, morbidity of CRC is high	2.67	1.05	3.14	0.89	2.62	1.04	.114
Compared with average men of the same age, morbidity of CRC is low^a	3.47	0.99	3.11	0.99	3.31	1.18	.503
Recovery from CRC is easier compared with other diseases	3.00	0.85	3.32	1.28	2.38	0.87	.046
If I suffer from colon cancer, I will not completely heal from it	2.73	0.88	2.93	0.81	2.23	0.83	.078

^aThe item's score was reversed before analysis.