Role of breast cancer screening in the overdiagnosis of thyroid cancer: results from a cross-sectional nationwide survey

Table 1 General characteristics of the study population

Variables	Thyroid ultrasonography										P value
	Total		None		Only mammography		Only ultrasonography		Both
	N	%	N	%	N	%	N	%	N	%
	2270	100	478	21.1	836	36.8	245	10.8	711	31.3
Age											< .0001
30–39	559	24.6	235	49.2	147	17.6	64	26.1	113	15.9
40–49	640	28.2	92	19.2	283	33.9	56	22.9	209	29.4
50–59	594	26.2	69	14.4	237	28.3	70	28.6	218	30.7
60–69	350	15.4	57	11.9	122	14.6	41	16.7	130	18.3
≥ 70	127	5.6	25	5.2	47	5.6	14	5.7	41	5.8
Educational level											0.1865
Middle school or below	338	14.9	73	15.3	131	15.7	33	13.5	101	14.2
High school	1265	55.7	242	50.6	469	56.1	145	59.2	409	57.5
College or above	667	29.4	163	34.1	236	28.2	67	27.3	201	28.3
Household income											0.0095
Low	559	24.6	121	25.3	203	24.3	68	27.8	167	23.5
Mid-low	469	20.7	114	23.8	182	21.8	37	15.1	136	19.1
Mid-high	671	29.6	148	31.0	247	29.5	62	25.3	214	30.1
High	571	25.2	95	19.9	204	24.4	78	31.8	194	27.3
Residential area											< .0001
Urban	1037	45.7	243	50.8	409	48.9	76	31.0	309	43.5
Suburban	1089	48.0	211	44.1	386	46.2	143	58.4	349	49.1
Rural	144	6.3	24	5.0	41	4.9	26	10.6	53	7.5
Occupational											0.8058
Unemployed	295	13.0	65	13.6	101	12.1	31	12.7	98	13.8
White	545	24.0	127	26.6	194	23.2	55	22.4	169	23.8
Pink	176	7.8	38	7.9	65	7.8	16	6.5	57	8.0
Blue	1254	55.2	248	51.9	476	56.9	143	58.4	387	54.4
Health insurance type											0.1674
NHI	2216	97.6	462	96.7	239	28.6	814	332.2	701	98.6
MAP	54	2.4	16	3.3	6	0.7	22	9.0	10	1.4
Family history^a											0.4120
Yes	336	14.8	64	13.4	120	14.4	34	13.9	118	16.6
No	1934	85.2	414	86.6	716	85.6	211	86.1	593	83.4
Concern about the risk of cancer											< .0001
Yes	1710	75.3	307	64.2	653	78.1	192	78.4	558	78.5
No	560	24.7	171	35.8	183	21.9	53	21.6	153	21.5

MAP Medical Aid Program, NHI National Health Insurance
^aOnly includes cancer history of first-degree relatives (parents, brothers, sisters)

ISSN: 1472-6874