Table 2 Odds ratios (OR) of a cervical cancer diagnosis by age, stage, and maximum interval between cervical screens

From: Impact of cervical screening on cervical cancer mortality: estimation using stage-specific results from a nested case–control study

  FIGO stage at diagnosis
   Stage 1A   Stage 1B   Stage 2   Stage 3 or worse
Screening history % Cases OR 95% CI % Cases OR 95% CI % Cases OR 95% CI % Cases OR 95% CI
Aged 25.5–34 years   n =1780   n =984   n =214   n =87
Not screened since age 22.5 years 31.5 1   40.2 1   54.7 1   56.3 1  
Regularly screened 35.7 0.76 0.65–0.88 31.7 0.59 0.48–0.71 28.5 0.28 0.17–0.43 32.2 0.16 0.06–0.37
Irregularly screened 32.8 0.95 0.80–1.12 28.0 0.72 0.58–0.88 16.8 0.39 0.25–0.60 41.4 0.27 0.13–0.56
OR linear trend   0.87 0.81–0.93   0.77 0.70–0.85   0.51 0.40–0.64   0.37 0.24–0.58
Aged 35–64 years   n =1921   n =2231   n =929   n =748
Not screened or > 13 yearly 19.3 1   23.6 1   43.9 1   57.6 1  
<5.5 yearly 38.6 0.33 0.27–0.38 39.7 0.25 0.21–0.28 23.3 0.10 0.07–0.12 15.4 0.05 0.03–0.06
5.5–7.5 yearly 17.0 0.53 0.43–0.64 15.4 0.38 0.31–0.46 12.1 0.17 0.12–0.22 9.9 0.10 0.06–0.14
7.5–13 yearly 25.2 0.87 0.72–1.06 21.2 0.62 0.51–0.74 20.8 0.37 0.28–0.48 17.1 0.20 0.14–0.27
OR linear trend   0.66 0.63–0.70   0.63 0.60–0.67   0.46 0.42–0.50   0.37 0.33–0.42
Aged 65–79 years   n =66   n =306   n =356   n =418
Not screened or > 13 yearly 36.4 1   35.3 1   39.3 1   47.6 1  
<5.5 yearly 47.0 0.31 0.14–0.67 44.4 0.39 0.28–0.54 40.4 0.32 0.24–0.44 31.8 0.19 0.14–0.26
5.5–7.5 yearly 6.1 0.30 0.08–1.04 8.5 0.53 0.31–0.91 7.9 0.29 0.18–0.48 7.4 0.23 0.14–0.37
7.5–13 yearly 10.6 0.29 0.10–0.84 11.8 0.59 0.37–0.96 12.4 0.62 0.39–1.01 13.2 0.61 0.40–0.94
OR linear trend   0.71 0.56–0.91   0.74 0.66–0.82   0.68 0.62–0.76   0.57 0.52–0.63