Table 1 Baseline characteristics according to four body mass index (BMI) categories
BMI<25 (n = 2036) | BMI25–29.9 (n = 3691) | BMI30–34.9 (n = 1279) | BMI ≥ 35 (n = 176) | P | |
|---|---|---|---|---|---|
Age, mean ± SD | 66.6 ± 8.2 | 66.0 ± 7.3 | 64.9 ± 7.1 | 63.8 ± 8.2 | <0.001 |
Sex | 0.003 | ||||
Women | 1358 | 2595 | 840 | 125 | |
Men | 678 | 1096 | 439 | 51 | |
Affected side | 0.289 | ||||
Left | 993 | 1821 | 591 | 86 | |
Right | 1043 | 1870 | 688 | 90 | |
Length of stay | 9.2 ± 3.6 | 9.2 ± 4.3 | 9.4 ± 3.8 | 9.9 ± 4.1 | 0.031 |
Surgery time, mins | 83.2 ± 25.7 | 83.7 ± 25.8 | 85.2 ± 24.6 | 89.9 ± 25.1 | <0.001 |
Total expense, RMB | 49,141.8 ± 17,126.6 | 57,477.6 ± 22,957.5 | 58,515.8 ± 16,421.8 | 71,234.9 ± 25,902.8 | <0.001 |
BMI, mean ± SD | 22.9 ± 1.7 | 27.3 ± 1.4 | 31.8 ± 1.4 | 38.1 ± 3.9 | <0.001 |
Number of combined underlying diseases | <0.001 | ||||
0 | 715 | 1151 | 359 | 53 | |
1 | 683 | 1287 | 447 | 60 | |
≥ 2 | 638 | 1253 | 473 | 63 |