Quartile of age-specific youth BMI Z-score: | Q1 | Q2 | Q3 | Q4 | % change in dense breast volume per unit youth BMI Z-score | p value* | |
---|---|---|---|---|---|---|---|
BMI at baseline visit (ages 8–10) | Model 1 | 155.5 (132.8, 182.1) | 110.6 (98.2, 124.5) | 102.2 (80.6, 129.7) | 63.1 (44.9, 88.9) | −28.1 % | <0.01 |
n = 182 | Model 2 | 142.8 (117.5, 173.5) | 107.7 (95.5, 121.4) | 105.9 (83.2, 134.8) | 68.2 (47.1, 98.9) | −22.9 % | <0.01 |
 | Model 3 | 145.0 (116.1, 181.2) | 109.4 (95.0, 126.1) | 95.6 (74.5, 122.7) | 64.9 (45.7, 92.0) | −25.2 % | <0.01 |
BMI at Year 3 visit (ages 11–13) | Model 1 | 154.1 (140,9, 168.4) | 127.9 (103.6, 157.7) | 91.0 (77.8, 106.3) | 59.8 (38.0, 94.0) | −31.6 % | <0.01 |
n = 170 | Model 2 | 142.2 (124.4, 162.6) | 126.0 (100.3, 158.3) | 95.0 (78.6, 114.9) | 63.1 (38.0, 104.7) | −29.5 % | <0.01 |
 | Model 3 | 147.2 (118.2, 183.2) | 120.4 (103.7, 139.7) | 89.4 (74.4, 107.4) | 58.5 (38.1, 89.8) | −32.3 % | <0.01 |
BMI at Year 5 visit (ages 13–15) | Model 1 | 161.2 (131.4, 197.7) | 128.7 (118.1, 140.4) | 82.9 (69.1, 99.5) | 56.1 (34.6, 90.8) | −35.6 % | <0.01 |
n = 153 | Model 2 | 166.4 (132.4, 209.2) | 133.5 (120.1, 148.3) | 84.6 (69.9, 102.3) | 51.4 (26.5, 99.7) | −36.9 % | <0.01 |
 | Model 3 | 156.2 (129.5, 188.5) | 121.7 (105.0, 141.0) | 85.2 (67.9, 107.0) | 48.8 (28.0, 85.0) | −38.1 % | <0.01 |
BMI at last visit (ages 15–17) | Model 1 | 152.8 (126.9, 183.8) | 123.7 (97.2, 157.4) | 97.6 (70.0, 135.4) | 65.9 (52.8, 82.2) | −28.8 % | <0.01 |
n = 159 | Model 2 | 138.9 (110.0, 175.5) | 120.1 (89.6, 160.9) | 102.5 (75.2, 139.8) | 70.6 (58.7, 84.9) | −23.7 % | <0.01 |
 | Model 3 | 130.3 (97.6, 173.8) | 118.8 (88.4, 159.6) | 97.6 (73.6, 129.3) | 66.2 (52.1, 84.0) | −23.7 % | <0.01 |