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. 2008 Jul 1;99(2):239–244. doi: 10.1038/sj.bjc.6604455

Table 3. Detection rate (per 10−4 person-years) of CIN2+ by number of previous screening episodes.

Age class (years) No. of previous screening episodes No. of cases (N=1110) Person-years (N=1 714 550) DR (95% CI) (per 10−4 person-years) DR ratio (95% CI)
All ages 1 594 933 165 5.98 (5.49–6.47) 1
  2 300 420 778 7.19 (6.37–8.01) 1.12 (0.98–1.29)
  3 131 197 909 7.58 (6.04–9.12) 1.04 (0.86–1.26)
  4 46 92 676 7.43 (3.29–11.58) 0.78 (0.58–1.05)
  5+ 39 70 022 6.32 (4.04–8.60) 0.87 (0.63–1.21)
           
25–49 1 518 634 520 8.16 (7.49–8.90) 1
  2 268 280 039 9.57 (8.49–10.79) 1.17 (1.01–1.36)
  3 114 129 361 8.81 (7.34–10.59) 1.08 (0.88–1.32)
  4 41 58 929 6.96 (5.12–9.45) 0.85 (0.62–1.17)
  5+ 36 42 905 8.39 (6.05–11.63) 1.03 (0.73–1.44)
           
50–64 s 1 76 298 645 2.55 (2.03–3.19) 1
  2 32 140 738 2.27 (1.61–3.22) 0.89 (0.59–1.35)
  3 17 68 548 2.48 (1.54–3.99) 0.98 (0.58–1.65)
  4 5 33 747 1.48 (0.62–3.56) 0.58 (0.24–1.44)
  5+ 3 27 117 1.11 (0.36–3.43) 0.44 (0.14–1.38)

CI=confidence interval; CIN=cervical intraepithelial neoplasia; DR=detection rate.

Standardised and stratified by age (25–49 years, 50–64 years).

Score test for trend of rates: P-value>0.5.