Quartile of age-specific youth BMI Z-score: | Q1 | Q2 | Q3 | Q4 | Change in adult percent breast density per unit youth BMI Z-score | p value* | |
---|---|---|---|---|---|---|---|
BMI at baseline visit (ages 8–10) | Model 1 | 40.9 (34.6, 47.2) | 32.9(30.0, 35.8) | 23.6 (19.6, 27.6) | 13.1 (9.4, 16.8) | −11.1 | <0.01 |
n = 182 | Model 2 | 31.3 (25.0, 37.6) | 28.9 (26.6, 31.3) | 26.7 (22.1, 31.3) | 23.7 (19.3, 28.0) | −2.7 | <0.01 |
 | Model 3 | 31.8 (25.2, 38.4) | 29.0 (26.0, 32.0) | 26.2 (22.2, 30.1) | 23.4 (18.0, 28.8) | −3.1 | <0.01 |
BMI at Year 3 visit (ages 11–13) | Model 1 | 43.3 (36.7, 50.0) | 34.6 (27.5, 41.8) | 19.7 (16.8, 22.6) | 12.8 (9.9, 15.7) | −12.9 | <0.01 |
n = 170 | Model 2 | 33.8 (27.6, 40.0) | 30.8 (24.8, 36.8) | 24.1 (21.5, 26.8) | 21.8 (18.6, 24.9) | −5.1 | <0.01 |
 | Model 3 | 34.5 (28.2, 40.7) | 30.4 (26.5, 34.2) | 25.0 (22.3, 26.9) | 21.1 (18.6, 23.5) | −5.4 | <0.01 |
BMI at Year 5 visit (ages 13–15) | Model 1 | 44.5 (38.7, 50.2) | 39.0 (33.0, 44.9) | 18.7 (15.0, 22.4) | 9.9 (6.8, 13.0) | −15.5 | <0.01 |
n = 153 | Model 2 | 35.4 (30.1, 40.8) | 31.8 (26.4, 37.2) | 22.7 (18.6, 26.9) | 21.6 (14.9, 28.2) | −6.2 | <0.01 |
 | Model 3 | 34.5 (29.3, 39.7) | 31.6 (19.3, 28.5) | 23.9 (19.3, 28.5) | 21.3 (14.8, 27.7) | −6.2 | <0.01 |
BMI at last visit (ages 15–17) | Model 1 | 44.7 (37.4, 51.9) | 36.0 (30.9, 41.1) | 23.9 (19.9, 28.0) | 11.0 (10.0, 12.0) | −14.0 | <0.01 |
n = 159 | Model 2 | 32.3 (26.6, 38.0) | 30.4 (23.4, 37.5) | 29.0 (24.6, 33.4) | 23.8 (22.0, 25.5) | −3.4 | <0.01 |
 | Model 3 | 32.1 (26.0, 38.1) | 30.7 (24.6, 36.8) | 29.0 (23.2, 34.9) | 23.3 (20.8, 25.8) | −3.6 | <0.01 |