Factors Associated with Longitudinal Changes in Mammographic Density in a Multiethnic Breast Screening Cohort of Postmenopausal Women
Table 3
Baseline characteristics of patients who exhibited a decrease or no change in the BI-RADS density category (among those with baseline BI-RADS B, C, or D).
Decreased (N = 268)
No change (N = 2560)
Total (N = 2828)
p value
Age at baseline
0.003
Mean (SD)
59.5 (9.1)
61.2 (8.7)
61.0 (8.7)
Range
37–89
33–92
33–92
Race/ethnicity
0.062
Non-Hispanic White
162 (60.4%)
1327 (51.8%)
1489 (52.7%)
Hispanic
51 (19.0%)
599 (23.4%)
650 (23.0%)
Non-Hispanic Asian
46 (17.2%)
517 (20.2%)
563 (19.9%)
Non-Hispanic other/unknown
9 (3.4%)
117 (4.6%)
126 (4.5%)
Menarche age
0.278
<12
37 (14.0%)
417 (16.5%)
454 (16.2%)
12 to 13
147 (55.5%)
1278 (50.5%)
1425 (50.9%)
>14
81 (30.6%)
837 (33.1%)
918 (32.8%)
Parity
0.437
No
56 (20.9%)
483 (18.9%)
539 (19.1%)
Yes
212 (79.1%)
2068 (81.1%)
2280 (80.9%)
Age at first birth
0.662
<20
35 (16.5%)
297 (14.4%)
332 (14.6%)
20 to 30
130 (61.3%)
1319 (64.0%)
1449 (63.7%)
>30
47 (22.2%)
445 (21.6%)
492 (21.6%)
Menopause age
0.025
<55
246 (91.8%)
2224 (87.0%)
2470 (87.5%)
55 and older
22 (8.2%)
332 (13.0%)
354 (12.5%)
Years since menopause
0.844
Less than 5
61 (23.0%)
573 (22.5%)
634 (22.5%)
5 or more
204 (77.0%)
1975 (77.5%)
2179 (77.5%)
Current hormone use
0.483
No
219 (81.7%)
2135 (83.4%)
2354 (83.2%)
Yes
49 (18.3%)
425 (16.6%)
474 (16.8%)
BMI category (race-specific)
0.574
Not overweight/obese
132 (50.0%)
1173 (46.6%)
1305 (46.9%)
Overweight
82 (31.1%)
827 (32.9%)
909 (32.7%)
Obese
50 (18.9%)
516 (20.5%)
566 (20.4%)
Smoking
0.234
Never
151 (77.4%)
1391 (77.1%)
1542 (77.2%)
Former
40 (20.5%)
331 (18.4%)
371 (18.6%)
Current
4 (2.1%)
81 (4.5%)
85 (4.3%)
Physical activity
0.91
None
37 (34.3%)
393 (35.7%)
430 (35.6%)
<150 min mild, moderate, or strenuous activity per week
35 (32.4%)
335 (30.5%)
370 (30.6%)
At least 150 min mild, moderate, or strenuous activity per week
