Table 3 Breast cancer screening rates for the period 2018–2020.

Characteristics	2018 (n = 1754^a)	2019 (n = 1795^a)	2020 (n = 1800^a)	2019 versus 2018			2020 versus 2019
Characteristics	SR, %^b	SR, %^b	SR, %^b	SE	SRR	95% CI	SE	SRR	95% CI
Overall	26.1	26.3	23.0	0.034	1.01	0.94–1.08	0.033	0.88	0.82–0.93
Age group, years
40–49	28.4	28.2	24.1	0.059	0.99	0.88–1.11	0.061	0.85	0.76–0.96
50–59	26.6	28.7	26.1	0.059	1.08	0.96–1.21	0.059	0.91	0.81–1.02
60–69	24.5	24.1	21.7	0.069	0.99	0.86–1.13	0.069	0.90	0.79–1.03
70–74	18.4	20.2	16.4	0.105	1.10	0.89–1.35	0.087	0.81	0.68–0.96
Residential area
Metropolitan	24.4	26.9	19.6	0.050	1.10	1.00–1.22	0.050	0.73	0.66–0.80
Urban	29.4	26.4	27.4	0.051	0.90	0.81–0.99	0.050	1.04	0.94–1.14
Rural	20.2	23.2	19.0	0.100	1.15	0.94–1.40	0.105	0.82	0.67–1.00
Monthly household income ($)
≤ 3999	22.4	24.7	22.3	0.057	1.10	0.99–1.23	0.056	0.90	0.81–1.01
4000–6999	27.4	23.6	20.9	0.056	0.86	0.77–0.96	0.058	0.89	0.79–0.99
≥ 7000	29.1	31.3	25.8	0.063	1.08	0.95–1.22	0.060	0.82	0.73–0.93
Education status
Middle school or lower	15.2	18.6	18.0	0.079	1.22	1.04–1.42	0.076	0.97	0.84–1.12
High school	27.7	28.0	23.0	0.044	1.01	0.93–1.10	0.044	0.82	0.75–0.90
College or higher	29.6	28.8	27.0	0.068	0.97	0.85–1.11	0.069	0.94	0.82–1.07
Chronic disease^c
No	25.3	27.4	22.0	0.043	1.08	0.99–1.18	0.044	0.80	0.74–0.88
Yes	27.2	24.5	24.2	0.054	0.90	0.81–1.00	0.052	0.99	0.89–1.09

SR screening rate, SRR screening rate ratio, SEstandard error, CI confidence interval.
^aThe n value is the number of women eligible for breast cancer screening (aged over 40 years); ^bSRs were defined as the proportion of screened women within the last 1 year; Weighting values from the Population and Housing Census were applied to calculate the SRs; ^cChronic disease, women who are diagnosed with any of the following diseases: hypertension, diabetes, tuberculosis, hepatitis B, hepatitis C, liver cirrhosis, chronic gastritis, stomach/duodenal ulcers, polyps, benign breast diseases, uterine myoma, and hyperlipidemia.

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