Table 3

 Standardised incidence ratios (SIR) for cervical cancer by time since diagnosis of cervical intraepithelial neoplasia grade 3 (CIN 3), stratified by period of diagnosis

Time since diagnosis of CIN 3 (years)SIR (95% CI) for diagnosis during 1958-70SIR (95% CI) for diagnosis during 1971-2002
1-<20.62 (0.23 to 1.64)4.42 (3.48 to 5.61)
2-41.17 (0.76 to 1.80)3.32 (2.83 to 3.90)
5-91.99 (1.50 to 2.63)2.84 (2.46 to 3.27)
10-142.40 (1.81 to 3.17)2.16 (1.81 to 2.59)
15-192.29 (1.67 to 3.14)1.65 (1.29 to 2.10)
20-242.06 (1.46 to 2.92)1.50 (1.07 to 2.10)
≥251.82 (1.37 to 2.43)1.45 (0.88 to 2.41)
P for trend0.005<0.001