Table 2:

Baseline demographic characteristics and screening exam results for new screening participants with an index screening exam from 2012 to 2017

CharacteristicNo. (%) of participants*
n = 112 249
Age at index exam, yr
 Mean (range)49.3 (40–74)
 40–4968 703 (61.2)
 50–5927 976 (24.9)
 60–6913 688 (12.2)
 70–751902 (1.7)
Ethnicity
 European or British ancestry56 706 (50.5)
 East or Southeast Asian27 614 (24.6)
 South Asian7783 (6.9)
 Aboriginal2867 (2.5)
 West Asian2130 (1.9)
 All others (including multiple ethnicities)10 848 (9.7)
 Not reported or unknown7319 (6.5)
Breast density (at index exam)
 A10 057 (9.0)
 B24 547 (21.9)
 C27 977 (24.9)
 D9000 (8.0)
 Missing40 668 (36.2)
Index exam year
 20129279 (8.3)
 201313 558 (12.1)
 201419 473 (17.4)
 201521 869 (19.5)
 201623 979 (21.4)
 201724 091 (21.5)
Recall rate
 Index exam abnormal/total index exams (% total index exams)21 894/112 249 (19.5)
 Subsequent abnormal exams/total subsequent exams (% of all subsequent)4965/55 304 (9.0)
Completion rate (% total)
 Index exam112 249 (100.0)
 First subsequent40 019 (35.7)
 Second subsequent11 508 (10.3)
 Third subsequent3037 (2.7)
 Fourth subsequent632 (0.6)
 Fifth subsequent108 (0.1)