Screen-detected and interval breast cancers according to tertiles of age and BMI at entry. Tertiles of age: Low (39 to 52); Middle (52 to 60); High (60 to 80). Tertiles of BMI: Low (16 to 23); Middle (23 to 26); High (26 to 50). aUnadjusted; bmutually adjusted (age and BMI); cmutually adjusted and adjusted for dense and non-dense area. BMI: body mass index; OR: odds ratio.