Quartile of age-specific youth BMI Z-score: | Q1 | Q2 | Q3 | Q4 | % change in non-dense breast volume per unit youth BMI Z-score | p value* | |
---|---|---|---|---|---|---|---|
BMI at baseline visit (ages 8–10) | Model 1 | 252.8 (209.2, 305.5) | 308.4 (242.4, 392.5) | 462.7 (425.1, 503.7) | 656.4 (573.4, 751.6) | 47.7 % | <0.01 |
n = 182 | Model 2 | 356.2 (294.2, 431.1) | 328.2 (300.0, 359.0) | 329.5 (282.9, 383.7) | 285.2 (244.6, 332.5) | −8.6 % | 0.04 |
 | Model 3 | 351.4 (291.1, 424.2) | 325.9 (290.9, 351.3) | 290.2 (243.5, 345.8) | 290.2 (243.5, 345.8) | −8.6 % | <0.01 |
BMI at Year 3 visit (ages 11–13) | Model 1 | 217.8 (166.7, 284.6) | 292.8 (226.3, 378.8) | 531.7 (430.4, 656.9) | 624.5 (581.7, 670.5) | 60.0 % | <0.01 |
n = 170 | Model 2 | 317.4 (244.5, 412.1) | 322.6 (272.5, 381.9) | 352.9 (321.8, 387.1) | 299.5 (262.3, 341.9) | −3.0 % | 0.64 |
 | Model 3 | 313.4 (241.2, 407.3) | 310.2 (267.3, 360.1) | 342.9 (313.0, 275.7) | 311.0 (278.5, 347.3) | −1.0 % | 0.80 |
BMI at Year 5 visit (ages 13–15) | Model 1 | 203.4 (173.5, 238.5) | 214.7 (166.8, 276.5) | 502.3 (424.2, 594.8) | 772.1 (652.2, 913.9) | 84.0 % | <0.01 |
n = 153 | Model 2 | 318.0 (263.0, 384.5) | 305.3 (247.2, 377.1) | 365.7 (321.7, 415.8) | 287.6 (242.6, 340.9) | −3.0 % | 0.71 |
 | Model 3 | 310.2 (271.6, 354.3) | 291.6 (247.0, 344.1) | 356.3 (300.8, 421.9) | 303.3 (267.9, 343.6) | 0.8 % | 0.85 |
BMI at last visit (ages 15–17) | Model 1 | 191.8 (154.8, 237.7) | 243.4 (216.1, 274.2) | 460.8 (386.1, 550.0) | 753.4 (702.2, 808,3) | 80.4 % | <0.01 |
n = 159 | Model 2 | 328.4 (277.1, 389.3) | 293.1 (261.7, 328.3) | 329.1 (275.3, 393.5) | 297.2 (270.4, 326.8) | −2.0 % | 0.60 |
 | Model 3 | 326.5 (286.6, 372.1) | 286.7 (257.0, 319.9) | 317.0 (258.9, 388.2) | 304.4 (279.2, 331.8) | 0.1 % | 0.98 |