Table 1.
Distribution of Demographic and Clinical Variables for CABG Patients by BMI Groups
| Characteristics | Normal (18.5–24.9) | Overweight (25.0–29.9) | Obese Class I (30.0–34.9) | Obese Class II (35.0–39.9) | Obese Class III (≥40.0) | P Value |
|---|---|---|---|---|---|---|
| Participants, No. (%) | 1509 (20) | 3080 (40.7) | 1942 (25.7) | 696 (9.2) | 333 (4.3) | |
| Age (SD), y | 68.8 (10.6) | 67.2 (10.4)a | 65.8 (9.8)a | 63.5 (9.6)a | 62.0 (9.3)a | <0.001 |
| Men, No. (%) | 1167 (77.3) | 2598 (84.4)a | 1592 (82.0)a | 544 (78.2) | 252 (75.7) | <0.001 |
| Height, mean (SD), cm | 170.2 (12.1) | 171.1 (11.0)a | 171.0 (8.9) | 169.5 (14.8) | 167.6 (11.7)a | <0.001 |
| Weigh, mean (SD), kg | 67.2 (8.9) | 80.8 (9.1)a | 94.3 (10.5)a | 107.7 (12.4)a | 125.4 (19.8)a | <0.001 |
| Concomitant disease, No. (%) | ||||||
| Cerebrovascular disease | 141 (9.3) | 229 (7.4)a | 112 (5.8)a | 45 (6.5)a | 25 (7.5) | 0.002 |
| Congestive heart failure | 151 (10.0) | 268 (8.7) | 166 (8.6) | 63 (9.1) | 37 (11.1) | 0.350 |
| Diabetes mellitus | 383 (25.4) | 1006 (32.7)a | 795 (40.9)a | 357 (51.3)a | 208 (62.5)a | <0.001 |
| Dialysis | 35 (2.3) | 37 (1.2)a | 18 (0.9)a | 8 (1.2) | 8 (2.4) | 0.003 |
| Hyperlipidemia | 1196 (79.3) | 2535 (82.3)a | 1678 (86.4)a | 612 (87.9)a | 287 (86.2)a | <0.001 |
| Hypertension | 1048 (69.5) | 2334 (75.8)a | 1597 (82.2)a | 593 (85.2)a | 285 (85.6)a | <0.001 |
| Liver or gastrointestinal disease | 49 (3.3) | 115 (3.7) | 62 (3.2) | 26 (3.7) | 8 (2.4) | 0.629 |
| Malignancy | 29 (1.9) | 64 (2.1) | 51 (2.6) | 14 (2.0) | 5 (1.5) | 0.515 |
| Peripheral vascular disease | 222 (14.7) | 328 (10.7)a | 205 (10.6)a | 73 (10.5)a | 29 (8.7)a | <0.001 |
| Pulmonary disease | 163 (10.8) | 300 (9.7) | 189 (9.7) | 85 (12.2) | 51 (15.3)a | 0.008 |
| Renal disease | 105 (7.0) | 200 (6.5) | 120 (6.2) | 60 (8.6) | 26 (7.8) | 0.208 |
| Smoking status, No. (%) | b | b | b | b | <0.001 | |
| Never | 301 (20.0) | 563 (18.3) | 332 (17.1) | 123 (17.7) | 65 (19.5) | |
| Former smoker | 479 (31.7) | 1223 (39.7) | 823 (42.4) | 314 (45.1) | 134 (40.2) | |
| Current smoker | 433 (28.7) | 717 (23.3) | 477 (24.6) | 140 (20.1) | 72 (21.6) | |
| Unknown | 296 (19.6) | 577 (18.7) | 310 (16.0) | 119 (17.1) | 62 (18.6) | |
| Prior event/treatment, No. (%) | ||||||
| CABG | 2 (0.1) | 5 (0.2) | 8 (0.4) | 0 (0) | 0 (0) | 0.133 |
| Myocardial infarction | 312 (20.7) | 651 (21.1) | 462 (23.8) | 143 (20.6) | 80 (24.0) | 0.090 |
| Percutaneous coronary intervention | 181 (12.0) | 472 (15.3)a | 321 (16.5)a | 95 (13.7) | 57 (17.1)a | 0.002 |
| Indication for catheterization | b | b | b | <0.001 | ||
| Stable angina | 597 (39.6) | 1365 (44.3) | 935 (48.2) | 313 (45.0) | 158 (47.5) | |
| Myocardial infarction | 564 (37.4) | 1054 (34.2) | 649 (33.4) | 238 (34.2) | 115 (34.5) | |
| Unstable angina | 205 (13.6) | 435 (14.1) | 247 (12.7) | 90 (12.9) | 49 (14.7) | |
| Other | 143 (9.5) | 226 (7.3) | 111 (5.7) | 55 (7.9) | 11 (3.3) | |
| Ejection fraction, No. (%) | b | b | 0.039 | |||
| >50% | 523 (34.7) | 1156 (37.5) | 778 (40.1) | 275 (39.5) | 128 (38.4) | |
| 35% to 50% | 301 (20.0) | 606 (19.7) | 379 (19.5) | 137 (19.7) | 64 (19.2) | |
| 20% to 34% | 80 (5.3) | 164 (5.3) | 94 (4.8) | 30 (4.3) | 22 (6.6) | |
| <20% | 28 (1.9) | 37 (1.2) | 23 (1.8) | 5 (0.7) | 8 (2.4) | |
| Not performed | 232 (15.4) | 414 (13.4) | 230 (11.8) | 78 (11.2) | 34 (10.2) | |
| Missing | 345 (22.9) | 703 (22.8) | 438 (22.6) | 171 (24.6) | 77 (23.1) | |
| Extent of coronary disease, No. (%) | 0.067 | |||||
| Low risk | 255 (16.9) | 438 (14.2) | 258 (13.3) | 100 (14.4) | 43 (12.9) | |
| High risk | 1238 (82.0) | 2607 (84.7) | 1667 (85.9) | 587 (84.3) | 288 (86.5) | |
| Missing | 16 (1.1) | 35 (1.1) | 17 (0.9) | 9 (1.3) | 2 (0.6) | |
CABG indicates coronary artery bypass graft surgery. Low risk indicates lesions with <50% stenosis, 1‐ or 2‐vessel disease. High risk indicates 2‐vessel disease with proximal left anterior descending artery or left main artery disease, 3‐vessel disease or left main artery disease.
a
Subgroup significantly different from the normal BMI group (P<0.05).
b
Significant difference in the distribution of the categories compared with normal BMI.