Analysis groups | |||
---|---|---|---|
Cases, Mean or N (SD/%)b | Subcohort, Mean or N (SD/%) | Eligible cohort, Mean or N (SD/%) | |
Number | 318 | 2,259 | 19,865c |
Age, years | 61.8 (11.2) | 58.0 (12.2) | 58.0 (12.2) |
Body mass index, kg/m2 | 28.9 (6.9) | 28.1 (6.5) | 28.2 (6.4) |
Post-menopausal hormone use | |||
Current | 61 (19.2%) | 445 (19.4%) | 3,554 (17.9%) |
Former | 85 (26.7%) | 505 (22.0%) | 4,561 (23.0%) |
Never | 148 (46.5%) | 1,143 (49.7%) | 9,986 (50.3%) |
Unknown | 24 (7.6%) | 205 (8.9%) | 1,764 (8.9%) |
Post-menopausal | 252 (79.3%) | 1,592 (69.3%) | 13,627 (68.6%) |
Imaging parameters | |||
Number | 254 | 1,910 | |
Percent density | 19.1 (13.7) | 17.6 (14.1) | |
Dense area, mm2 | 2,622 (1,939) | 2,333 (1,841) | |
Non-dense area, mm2 | 13,232 (6,702) | 13,460 (7,198) | |
Milliampere-seconds | 161.0 (49.4) | 157.9 (49.5) | |
X-ray tube voltage peak, kVp | 26.2 (1.7) | 26.1 (1.5) | |
Thickness, mm | 53.9 (13.3) | 53.2 (12.7) | |
Compression force, pounds | 24.7 (6.1) | 24.9 (5.6) |