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Table 2 Proportional incidence of first-year interval breast cancers by type of previous negative mammography report.

From: Incidence, detection, and tumour stage of breast cancer in a cohort of Italian women with negative screening mammography report recommending early (short-interval) rescreen

  Mammography report
  Standard negative Negative with RES
Woman-years at risk, n* 272,710 3286
OBS, n (rate)† 96 (35.3) 4 (121.7)
EXP, n 640.4 7.6
OBS:EXP ratio (95% CI) 0.15 (0.12-0.18) 0.53 (0.14-1.35)
Ratio‡ of the OBS:EXP ratios (95% CI) 1.00 (referent) 3.51 (0.94-9.29)
  1. * Adjusted for general mortality and rounded to the whole-number value.
  2. † Per 100,000 woman-years at risk.
  3. ‡ Adjusted for woman's age (5-year groups).
  4. RES, recommendation for early (<24 months) rescreen; OBS:EXP ratio, observed:expected ratio or proportional incidence of interval cancers; CI, confidence interval.