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Table 4: Comorbidities by body mass index group
Underweight and Sub-
normal Overweight Class I Class II Class III P-value analysis
n % n % n % n % n %
Overall 951 2,011 1,708 830 516
Race
White 407 42.8 947 47.1 801 46.9 390 47.0 228 44.2 0.0004 abcdefghij
Black 55 5.8 187 9.3 275 16.1 209 25.2 192 37.2
Hispanic 10 1.1 10 0.5 9 0.5 4 0.5 0 0.0
Other 14 1.5 18 0.9 11 0.6 6 0.7 4 0.8
Unknown 465 48.9 849 42.2 612 35.8 221 26.6 92 17.8
Age, years 0.0045 bhi
< 45 503 52.9 1,005 50.0 797 46.7 432 52.0 272 52.7
45-65 393 41.3 876 43.6 806 47.2 358 43.1 230 44.6
> 65 55 5.8 130 6.5 105 6.1 40 4.8 14 2.7
Diabetes 0.0004 abcdefghij
None 941 98.9 1,962 97.6 1,618 94.7 775 93.4 440 85.3
Insulin
dependent 2 0.2 7 0.3 12 0.7 15 1.8 16 3.1
Non-insulin
dependent 8 0.8 42 2.1 78 4.6 40 4.8 60 11.6
Any
diabetes 10 1.1 49 2.4 90 5.3 55 6.6 76 14.7 < 0.0001 abcdefgij
Active smoking 89 9.4 212 10.5 209 12.2 110 13.3 55 10.7 0.0474 bcf
Alcohol use 7 0.7 17 0.8 13 0.8 1 0.1 2 0.4 0.1788
Respiratory
disease 5 0.5 26 1.3 45 2.6 42 5.1 51 9.9 < 0.0001 bcdefghij
Hypertension 81 8.5 319 15.9 433 25.4 254 30.6 220 42.6 < 0.0001 abcdefghij
30-day prior
wound infection 3 0.3 5 0.2 12 0.7 1 0.1 2 0.4 0.1641
Heart disease 5 0.5 9 0.4 11 0.6 4 0.5 5 1.0 0.6535
Weight loss 3 0.3 2 0.1 4 0.2 2 0.2 1 0.2 0.6470
Bleeding disorder 6 0.6 6 0.3 9 0.5 2 0.2 5 1.0 0.2148
Preoperative
sepsis 1 0.1 0 0.0 0 0.0 4 0.5 1 0.2 NR
Prior operation
within 30 days 0 0.0 6 0.3 1 0.1 1 0.1 0 0.0 NR
Total
comorbidities < 0.0001 abcdefghij
0 736 77.4 1,385 68.9 978 57.3 419 50.5 204 39.5
1 184 19.3 517 25.7 547 32.0 295 35.5 182 35.3
2 or more 31 3.3 109 5.4 183 10.7 116 14.0 130 25.2

P-value subanalysis key: P-value < 0.05 in a (underweight and normal vs. overweight), b (underweight and normal vs. class I), c (underweight and
normal vs. class II), d (underweight and normal vs. class III), e (overweight vs. class I), f (overweight vs. class II), g (overweight vs. class III), h (class I vs.
class II), i (class I vs. class III), j (class II vs. class III). P-values are not reported (NR) for any variables with a cell size of 0

cardiac surgery and history of angina), recent weight neurologic (stroke, coma, peripheral nerve injury),
loss, bleeding disorder, preoperative sepsis, and prior cardiac (myocardial infarction and cardiac arrest), sepsis,
operation within 30 days. death, venous thromboembolism, failure to wean from
ventilator, unplanned reintubation, pneumonia, bleeding,
Surgical complications included wound complications, and urinary tract infection. Multivariable analysis of
unplanned return to the operating room and graft/flap postoperative outcomes was performed to control for
failure. Wound complications encompassed superficial those preoperative and intraoperative variables with n >
surgical site infection (SSI), deep SSI, organ/deep space 10 events, and P < 0.05 on bivariate screen.
SSI, and wound dehiscence. Medical complications were
defined as renal (renal failure and renal insufficiency), Obese and non-obese patients were then 1:1
262 Plast Aesthet Res || Volume 3 || July 28, 2016