Factors Associated with Longitudinal Changes in Mammographic Density in a Multiethnic Breast Screening Cohort of Postmenopausal Women
Table 2
Baseline characteristics of patients who exhibited an increase or no change in the BI-RADS density category (among those with baseline BI-RADS A, B, or C).
Increased (N = 227)
No change (N = 2644)
Total (N = 2871)
value
Age at baseline
0.27
Mean (SD)
62.3 (9.38)
61.6 (8.69)
61.70 (8.74)
Range
39–83
34–92
34–92
Race/ethnicity
0.016
Non-Hispanic White
111 (48.9%)
1375 (52.0%)
1486 (51.8%)
Hispanic
45 (19.8%)
674 (25.5%)
719 (25.0%)
Non-Hispanic Asian
56 (24.7%)
454 (17.2%)
510 (17.8%)
Non-Hispanic other/unknown
15 (6.6%)
141 (5.3%)
156 (5.4%)
Menarche age
0.563
<12
47 (21.3%)
482 (18.4%)
529 (18.7%)
12 to 13
105 (47.5%)
1309 (50.1%)
1414 (49.9%)
>14
69 (31.2%)
824 (31.5%)
893 (31.5%)
Parity
0.925
No
40 (17.7%)
473 (18.0%)
513 (17.9%)
Yes
186 (82.3%)
2162 (82.0%)
2348 (82.1%)
Age at first birth
0.227
<20
21 (11.3%)
345 (16.0%)
366 (15.6%)
20 to 30
128 (68.8%)
1388 (64.4%)
1516 (64.8%)
>30
37 (19.9%)
421 (19.5%)
458 (19.6%)
Menopause age
0.437
<55
200 (88.9%)
2300 (87.1%)
2500 (87.2%)
55 and older
25 (11.1%)
341 (12.9%)
366 (12.8%)
Years since menopause
0.238
Less than 5
38 (17.0%)
533 (20.3%)
571 (20.0%)
5 or more
186 (83.0%)
2099 (79.7%)
2285 (80.0%)
Current hormone use
0.804
No
191 (84.1%)
2241 (84.8%)
2432 (84.7%)
Yes
36 (15.9%)
403 (15.2%)
439 (15.3%)
BMI category (race-specific)
0.211
Not overweight/obese
100 (44.2%)
1023 (39.4%)
1123 (39.8%)
Overweight
76 (33.6%)
872 (33.6%)
948 (33.6%)
Obese
50 (22.1%)
702 (27.0%)
752 (26.6%)
Smoking
0.493
Never
115 (79.3%)
1389 (75.9%)
1504 (76.2%)
Former
26 (17.9%)
355 (19.4%)
381 (19.3%)
Current
4 (2.8%)
85 (4.6%)
89 (4.5%)
Physical activity
0.244
None
44 (43.6%)
430 (38.0%)
474 (38.5%)
<150 min mild, moderate, or strenuous activity per week
33 (32.7%)
342 (30.2%)
375 (30.4%)
At least 150 min mild, moderate, or strenuous activity per week
