Table 1.
Baseline characteristics of the age/BMI categories. Results are presented as mean (SD) for continuous variables and N (number) and % for categorical variables. Age/BMI was divided into four groups: group 1 (age/BMI < 1.0), group 2 (age/BMI > 1.0 & <2.0), group 3 (age/BMI > 2.0 & <3.0), and group 4 (age/BMI > 3.0).a
| Age/BMI Groups | |||||
|---|---|---|---|---|---|
| Group 1 | Group 2 | Group 3 | Group 4 | P value | |
| Number | 89,130 | 2,17,192 | 1,04,635 | 24,095 | |
| Age Mean (SD) | 29.05 (7.33) | 46.87 (11.31) | 65.56 (9.65) | 77.89 (8.27) | <0.0001 |
| Sex (female) N (%) | 75,481 (84.72) | 1,53,932 (70.91) | 61,194 (58.52) | 14,414 (59.87) | <0.0001 |
| Height (inch) Mean (SD) | 64.47 (3.73) | 65.09 (3.95) | 65.44 (4.04) | 64.98 (4.07) | <0.0001 |
| Weight (lb) Mean (SD) | 226.95 (62.16) | 193.57 (44.82) | 167.86 (31.00) | 137.34 (25.17) | <0.0001 |
| BMI Mean (SD) | 38.25 (9.10) | 32.03 (6.47) | 27.47 (3.90) | 22.76 (2.91) | <0.0001 |
| Age/BMI | 0.77 (0.15) | 1.48 (0.28) | 2.40 (0.27) | 3.46 (0.44) | <0.0001 |
| OP time (min) Mean (SD) | 68.54 (43.64) | 69.25 (48.08) | 72.42 (56.53) | 73.25 (56.13) | <0.0001 |
| Race (white) N (%) | 59,193 (66.41) | 1,47,771 (68.04) | 73,599 (70.34) | 17,580 (72.96) | <0.0001 |
| BMI > 30 N (%) | 35,591 (24.91) | 46,288 (28.72) | 37,860 (33.94) | 7,373 (37.96) | <0.0001 |
| Smoking N (%) | 18,272 (20.50) | 38,810 (17.87) | 14,426 (13.79) | 2,432 (10.09) | <0.0001 |
| Diabetes N (%) | 5,258 (5.90) | 26,973 (12.42) | 19,153 (18.30) | 3,892 (16.15) | <0.0001 |
| Hypertension N (%) | 10,189 (11.43) | 66,469 (30.60) | 55,536 (53.08) | 15,346 (63.69) | <0.0001 |
| Systemic sepsis in the previous 48 h N (%) | 8,599 (6.02) | 10,710 (6.64) | 10,759 (9.65) | 3,003 (15.46) | <0.0001 |
| Steroid use N (%) | 1,409 (0.99) | 3,324 (2.06) | 3,596 (3.22) | 678 (3.49) | <0.0001 |
| ASA IV/V N (%) | 870 (0.98) | 3,258 (1.50) | 4,021 (3.85) | 1,924 (8.00) | <0.0001 |
| Inpatient N (%) | 33,092 (37.13) | 79,461 (36.59) | 45,148 (43.15) | 13,352 (55.41) | <0.0001 |
| Transfusion N (%) | 101 (0.11) | 357 (0.16) | 315 (0.30) | 173 (0.72) | <0.0001 |
| Wound infection N (%) | 1,270 (1.42) | 6,175 (2.84) | 5,680 (5.43) | 1,698 (7.05) | <0.0001 |
| Dyspnea N (%) | 2,423 (2.72) | 8,022 (3.69) | 5,938 (5.67) | 1,922 (7.98) | <0.0001 |
| Congestive heart failure in the previous 30 days N (%) | 104 (0.12) | 764 (0.35) | 909 (0.87) | 424 (1.76) | <0.0001 |
| COPD N (%) | 328 (0.37) | 3,951 (1.82) | 4,839 (4.62) | 1,933 (8.02) | <0.0001 |
| Ascites N (%) | 45 (0.05) | 246 (0.11) | 248 (0.24) | 89 (0.37) | <0.0001 |
| Renal failure N (%) | 32 (0.04) | 277 (0.13) | 306 (0.29) | 91 (0.38) | <0.0001 |
| Bleeding disease N (%) | 711 (0.080) | 3,809 (1.75) | 4,634 (4.43) | 1,714 (7.11) | <0.0001 |
| Disseminated cancer N (%) | 69 (0.08) | 941 (0.43) | 1,385 (1.32) | 473 (1.96) | <0.0001 |
a
OP time, operation time; ASA, American Society of Anesthesiologists; COPD, chronic obstructive pulmonary disease.