Table 2. Observed impacts of cervical screening in 100 000 women in Wales and England.

Data sources	Age at risk (years)	Age of data (years)	100 000 Women invited in Wales	100 000 Women invited in England	Excess in Wales
National statistics for 2010/11a
Screening tests	20–24	20–24	134 961	8 546
	25–29	25–26b	54 857	70 710
		Sum	189 818	79 256	110 562
Non-negative test results	20–24	20–24	23 968	1 658
	25–29	25–26	6 988	9 045
		Sum	30 956	10 703	20 253
Moderate dyskaryosis or worse	20–24	20–24	3227	270
	25–29	25–26	1548	2189
		Sum	4775	2459	2316
Average incidencec 2000–2011 for Wales, 2010–2011 for England
Cancers (all)	20–24	20–24	19.7	12.5
	25–29	25–26d	30.8	36.7
		Sum	50.5	49.2	1.3
Proportions observed in Audit datae
Cancers (stage 1A)	20–24	20–24	7.9	4.3
	25–29	25–26	15.0	21.4
		Sum	22.8	25.7	−2.8
Cancers (stage 1B+) including unknowns	20–24	20–24	11.8	8.2
	25–29	25–26	15.8	15.3
		Sum	27.6	23.5	4.1

^aSee Supplementary Table 1.

^bCumulative numbers of tests are 2 times the annual incidence rate in Wales and 2.5 times the annual incidence rate in England.

^cSee Supplementary Table 3.

^dCumulative number of cancers is two times the annual incidence rate (shown in Supplementary Table S3) age 25–29 for both England and Wales.

^eSee Supplementary Table 4.