Table 1 Comparison of patient characteristics in different BMI groups
From: Obesity paradox among patients undergoing total knee arthroplasty: a retrospective cohort study
Underweight | Normal weight | Overweight | Obese | P | |||
|---|---|---|---|---|---|---|---|
(n = 27) | (n = 905) | I(n = 863) | II(n = 615) | I(n = 500) | II(n = 59) | ||
Age, year old | 51.5 ± 19.7 | 66.8 ± 10.6 | 66.6 ± 7.8 | 66.8 ± 7.6 | 66.0 ± 7.9 | 65.4 ± 7.0 | < 0.001 |
Old than 65 years old | 8(29.6%) | 544(60.1%) | 500(57.9%) | 343(55.8%) | 259(51.8%) | 28(47.5%) | 0.003 |
Female | 16(59.3%) | 686(75.8%) | 710(82.3%) | 497(80.8%) | 436(87.2%) | 54(91.5%) | < 0.001 |
ASA ≥ 3 | 0 | 55(6.1%) | 81(9.4%) | 39(6.3%) | 45(9.0%) | 5(8.5%) | 0.035 |
Diagnosis | < 0.001 | ||||||
OA | 9(33.3%) | 801(88.5) | 816(94.6%) | 593(96.4%) | 480(96.0%) | 58(98.3%) | |
Diagnosis other than OA | 18(66.7%) | 104(11.5%) | 47(5.4%) | 22(3.6%) | 20(4.0%) | 1(1.7%) | |
Comorbidity | |||||||
Hypertension | 0 | 411(45.4%) | 486(56.3%) | 392(63.7%) | 350(70.0%) | 42(71.2%) | < 0.001 |
CAD | 2(7.4%) | 87(9.6%) | 102(11.8%) | 77(12.5%) | 77(15.4%) | 8(13.6%) | 0.046 |
CVD | 2(7.4%) | 47(5.2%) | 52(6.0%) | 38(6.2%) | 25(5.0%) | 1(1.7%) | 0.671 |
COPD | 1(3.7%) | 17(1.9%) | 11(1.3%) | 10(1.6%) | 15(3.0%) | 2(3.4%) | 0.259 |
Diabetes mellitus | 0 | 149(16.5%) | 176(20.4%) | 123(20%) | 91(18.2%) | 17(28.8%) | 0.008 |
Hemoglobin(g/l) | 122 ± 14 | 131 ± 14 | 134 ± 41 | 133 ± 13 | 132 ± 12 | 132 + 10 | 0.042 |
Preoperative anemia | 13(48.1%) | 191(21.1%) | 113(13.1%) | 75(12.2%) | 77(15.4%) | 5(8.5%) | < 0.001 |