Table 5 Association between screening and cervical cancer incidence and mortality

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

Age group (years) Screening history Direct OR for incidence a Indirect RR for incidence b Indirect RR for mortality
25.5–34 Regularly screened 0.63 (0.56–0.70) 0.61 (0.54–0.68) 0.27 (0.21–0.34)
  Irregularly screened 0.77 (0.68–0.87) 0.76 (0.67–0.86) 0.37 (0.29–0.46)
  Never screened 1.00 1.00 1.00
35–64 <5.5 yearly 0.18 (0.16–0.20) 0.18 (0.16–0.19) 0.08 (0.07–0.09)
  5.5–7.5 yearly 0.29 (0.26–0.33) 0.28 (0.25–0.32) 0.14 (0.12–0.17)
  7.5–13 yearly 0.51 (0.46–0.57) 0.49 (0.41–0.60) 0.28 (0.23–0.33)
  Not screened or >13 yearly 1.00 1.00 1.00
65–79 <5.5 yearly 0.28 (0.24–0.34) 0.26 (0.22–0.32) 0.24 (0.20–0.30)
  5.5–7.5 yearly 0.31 (0.24–0.42) 0.31 (0.23–0.42) 0.28 (0.19–0.39)
  7.5–13 yearly 0.57 (0.44–0.74) 0.57 (0.43–0.75) 0.60 (0.46–0.77)
  Not screened or >13 yearly 1.00 1.00 1.00
  1. aWithout reference to stage.
  2. bCombining stage-specific estimates.