Table 3

Estimates and 95% CI of age-adjusted breast cancer rate ratios in females by age-adjusted HD incidence rates among females 15–34 years of age: 135 populations in the world in 1988–1992

Age-adjusted HD rate among females 15–34 years of age (1/100,000)Rate ratio estimate95% CI for rate ratio
<1.51.0
1.5–5.02.6a(2.2, 3.0)
≥5.03.9a(3.3, 4.5)
  • a P < 0.001.