Non-progressive breast carcinomas detected at mammography screening: a population study

Breast Cancer Research

Table 1 The BreastScreen Norway mammography screening program and women included in the study

Study data
Area	Norway
Time period	1987–2019
Age range^a	49–84
Design	Dynamic cohort study
Person-years under study	23,709,444
DCIS or invasive breast cancer cases	63,378
BreastScreen Norway
Implementation period	1995–2005
Target age range and frequency	50–69 every second year
Attendance rate	76%
Screening test	Two-view mammography
Evaluation	Two independent readers
Women in invited birth cohorts	1,063,409 (approximated)
Proportion of cases screening-detected aged 50–69 years	68% (year 2016–2019)

^aData are given by birth cohort and calendar year, aiming at 49–84 years of age

ISSN: 1465-542X