Table 2. Comparison of the cervical cancer screening rate between the index year of 2008 and the free-coupon program years of 2009–2012.

Age, years	2008	2009–2012
	Rate of screening	Rate of screening	Rate ratio	95% CI
20	1.4%	10.2%	7.1	5.9–8.6
21–24		3.1%	2.2	1.8–2.6
25	3.3%	20.8%	6.4	5.7–7.1
26–29		6.3%	1.9	1.7–2.2
30	7.8%	24.2%	3.1	2.9–3.3
31–34		9.0%	1.2	1.1–1.2
35	8.0%	26.0%	3.3	3.1–3.5
36–39		8.8%	1.1	1.1–1.2
40	8.0%	23.9%	3.0	2.8–3.2
41–44		8.7%	1.1	1.0–1.2