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.