Table 1.
Characteristics of the Study Population According to Baseline BMI Tertiles by Sex and Race (in 1987-1989)
| White (n = 10,222) |
Black (n = 3,274) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Men (n = 4,802) |
Women (n = 5,420) |
Men (n = 1,270) |
Women (n = 2,004) |
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| Characteristic | T1a (n = 1,601) |
T2a (n = 1,600) |
T3aaa (n = 1,601) |
T1a (n = 1,809) |
T2a (n = 1,803) |
T3a (n = 1,808) |
T1a (n = 423) |
T2a (n = 424) |
T3aA (n = 423) |
T1a (n = 668) |
T2a (n = 668) |
T3a (n = 668) |
| BMI, kg/m2 | 23.5 (1.5) | 26.8 (0.8) | 31.4 (3.1) | 21.6 (1.2) | 25.3 (1.1) | 32.2 (4.2) | 22.7 (1.7) | 26.9 (1.1) | 32.2 (3.5) | 24.2 (2.0) | 29.3 (1.4) | 37.4 (5.2) |
| WHRb | 0.93 (0.05) | 0.97 (0.04) | 1.00 (0.04) | 0.84 (0.07) | 0.88 (0.07) | 0.93 (0.07) | 0.90 (0.05) | 0.93 (0.04) | 0.97 (0.05) | 0.85 (0.07) | 0.90 (0.07) | 0.94 (0.07) |
| Predicted % fatb | 25.1 (2.3) | 28.2 (2.0) | 32.2 (3.2) | 35.4 (1.5) | 39.1 (1.4) | 45.5 (3.9) | 22.3 (2.6) | 25.9 (2.3) | 30.8 (4.1) | 36.1 (2.1) | 40.9 (1.6) | 48.5 (4.8) |
| eGFR, mL/min/1.73 m2b | 99.5 (11.1) | 97.8 (11.0) | 970 (11.6) | 103.0 (10.3) | 101.2 (11.4) | 100.4 (12.0) | 112.3 (15.5) | 107.9 (15.4) | 105.4 (16.7) | 115.4 (16.3) | 114.8 (15.9) | 115.4 (16.2) |
| Age, yb | 55.3 (5.7) | 55.1 (5.7) | 54.9 (5.6) | 53.9 (5.7) | 54.5 (5.6) | 54.5 (5.7) | 54.6 (6.0) | 53.8 (5.9) | 53.6 (5.7) | 53.3 (5.8) | 53.4 (5.6) | 53.2 (5.7) |
| Current smokerb | 510 (31.9%) | 358 (22.4%) | 325 (20.3%) | 558 (30.9%) | 438 (24.3%) | 339 (18.8%) | 217 (51.3%) | 157 (37.1%) | 113 (26.7%) | 226 (33.9%) | 158 (23.7%) | 126 (18.9%) |
| HTN med useb | 203 (12.7%) | 265 (16.7%) | 380 (23.9%) | 169 (9.4%) | 283 (15.7%) | 471 (26.2%) | 89 (21.1%) | 127 (30.1%) | 166 (39.4%) | 199 (29.9%) | 255 (38.4%) | 310 (46.8%) |
| SBP, mm Hgb | 116.6 (15.6) | 119.2 (15.6) | 122.0 (15.2) | 111.6 (16.3) | 115.7 (17.1) | 121.3 (16.8) | 127.7 (22.6) | 129.4 (21.6) | 130.7 (20.5) | 123.3 (20.8) | 125.2 (18.4) | 129.9 (20.3) |
| HDL-C, mg/Lb | 47.1 (13.9) | 42.6 (11.5) | 39.9 (10.2) | 64.8 (17.6) | 58.6 (16.3) | 51.7 (14.0) | 57.6 (20.3) | 50.0 (14.2) | 46.1 (12.6) | 63.9 (18.7) | 59.0 (17.3) | 55.3 (14.2) |
| Prevalent CHDb | 123 (79%) | 120 (7.6%) | 132 (8.4%) | 17 (1.0%) | 27 (1.5%) | 35 (2.0%) | 15 (3.6%) | 17 (4.1%) | 22 (5.2%) | 14 (2.2%) | 12 (1.8%) | 12 (1.8%) |
| HS graduateb | 1,329 (83.2%) | 1,316 (82.4%) | 1,321 (82.6%) | 1,625 (89.9%) | 1,553 (86.1%) | 1,416 (78.4%) | 225 (53.4%) | 253 (60.0%) | 251 (59.6%) | 487 (73.0%) | 411 (61.6%) | 375 (56.2%) |
| Annual family income < $25kb | 335 (20.9%) | 284 (17.8%) | 308 (19.2%) | 423 (23.4%) | 496 (27.5%) | 612 (33.8%) | 253 (59.8%) | 217 (51.2%) | 209 (49.4%) | 384 (57.5%) | 440 (65.9%) | 484 (72.5%) |
Note: N = 13,496. Mean (standard deviation) for continuous variables and number (percent) for categorical variables.
Abbreviations: BMI, body mass index; CHD, coronary heart disease; eGFR, estimated glomerular filtration rate; HDL-C, high-density lipoprotein cholesterol; HS, high school; HTN, hypertension; med, medication; SBP, systolic blood pressure; T, tertile; WHR, waist-to-hip ratio.
The cutoff points between the low and mid tertiles and between mid and high tertiles are 25.4 and 28.3 kg/m2 for White men, 23.4 and 27.5 kg/m2 for White women, 25.1 and 28.8 kg/m2 for Black men, and 27.0 and 32.0 kg/m2 for Black women.
P < 0.001 for comparing BMI groups; P value calculated by analysis of variance for continuous variables and X2 test for categorical variables.