Table 1. Distribution of Demographic and Clinical Variables for CABG Patients by BMI Groups
CharacteristicsNormal (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), y68.8 (10.6)67.2 (10.4)a65.8 (9.8)a63.5 (9.6)a62.0 (9.3)a<0.001
Men, No. (%)1167 (77.3)2598 (84.4)a1592 (82.0)a544 (78.2)252 (75.7)<0.001
Height, mean (SD), cm170.2 (12.1)171.1 (11.0)a171.0 (8.9)169.5 (14.8)167.6 (11.7)a<0.001
Weigh, mean (SD), kg67.2 (8.9)80.8 (9.1)a94.3 (10.5)a107.7 (12.4)a125.4 (19.8)a<0.001
Concomitant disease, No. (%)
Cerebrovascular disease141 (9.3)229 (7.4)a112 (5.8)a45 (6.5)a25 (7.5)0.002
Congestive heart failure151 (10.0)268 (8.7)166 (8.6)63 (9.1)37 (11.1)0.350
Diabetes mellitus383 (25.4)1006 (32.7)a795 (40.9)a357 (51.3)a208 (62.5)a<0.001
Dialysis35 (2.3)37 (1.2)a18 (0.9)a8 (1.2)8 (2.4)0.003
Hyperlipidemia1196 (79.3)2535 (82.3)a1678 (86.4)a612 (87.9)a287 (86.2)a<0.001
Hypertension1048 (69.5)2334 (75.8)a1597 (82.2)a593 (85.2)a285 (85.6)a<0.001
Liver or gastrointestinal disease49 (3.3)115 (3.7)62 (3.2)26 (3.7)8 (2.4)0.629
Malignancy29 (1.9)64 (2.1)51 (2.6)14 (2.0)5 (1.5)0.515
Peripheral vascular disease222 (14.7)328 (10.7)a205 (10.6)a73 (10.5)a29 (8.7)a<0.001
Pulmonary disease163 (10.8)300 (9.7)189 (9.7)85 (12.2)51 (15.3)a0.008
Renal disease105 (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
Never301 (20.0)563 (18.3)332 (17.1)123 (17.7)65 (19.5)
Former smoker479 (31.7)1223 (39.7)823 (42.4)314 (45.1)134 (40.2)
Current smoker433 (28.7)717 (23.3)477 (24.6)140 (20.1)72 (21.6)
Unknown296 (19.6)577 (18.7)310 (16.0)119 (17.1)62 (18.6)
Prior event/treatment, No. (%)
CABG2 (0.1)5 (0.2)8 (0.4)0 (0)0 (0)0.133
Myocardial infarction312 (20.7)651 (21.1)462 (23.8)143 (20.6)80 (24.0)0.090
Percutaneous coronary intervention181 (12.0)472 (15.3)a321 (16.5)a95 (13.7)57 (17.1)a0.002
Indication for catheterization b b b <0.001
Stable angina597 (39.6)1365 (44.3)935 (48.2)313 (45.0)158 (47.5)
Myocardial infarction564 (37.4)1054 (34.2)649 (33.4)238 (34.2)115 (34.5)
Unstable angina205 (13.6)435 (14.1)247 (12.7)90 (12.9)49 (14.7)
Other143 (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 performed232 (15.4)414 (13.4)230 (11.8)78 (11.2)34 (10.2)
Missing345 (22.9)703 (22.8)438 (22.6)171 (24.6)77 (23.1)
Extent of coronary disease, No. (%)0.067
Low risk255 (16.9)438 (14.2)258 (13.3)100 (14.4)43 (12.9)
High risk1238 (82.0)2607 (84.7)1667 (85.9)587 (84.3)288 (86.5)
Missing16 (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.