Table 1 Comparison of patient backgrounds and operative factors in the low, normal, and high BMI groups.
From: Impact of body mass index on outcomes after lumbar spine surgery
Variables | Low BMI (BMI < 18.5) | Normal BMI (18.5 ≤ BMI < 30) | High BMI (BMI ≥ 30) | P | |||
|---|---|---|---|---|---|---|---|
No. of patients (%) | 194 | (3.5) | 5027 | (89.4) | 401 | (7.1) | |
Mean age in years (SD) | 62.7 | (18.9) | 64.6 | (15.3) | 57.3 | (15.5) | < 0.001 |
Males, no. (%) | 50 | (25.8) | 3198 | (63.6) | 262 | (65.3) | < 0.001 |
Mean height in cm (SD) | 158.6 | (9.7) | 162.5 | (10.0) | 163.8 | (11.5) | < 0.001 |
Mean BMI in kg/m2 (SD) | 17.5 | (0.9) | 24.0 | (2.7) | 33.2 | (3.2) | < 0.001 |
Disease, no. (%) | |||||||
LSS | 121 | (62.4) | 3532 | (70.3) | 272 | (67.8) | 0.042 |
Disc hernia | 73 | (37.6) | 1495 | (29.7) | 129 | (32.2) | |
ASA-PS, no. (%) | |||||||
1 | 65 | (33.5) | 1196 | (23.8) | 29 | (7.2) | < 0.001 |
2 | 107 | (55.2) | 3433 | (68.3) | 287 | (71.6) | |
3 | 22 | (11.3) | 396 | (7.9) | 85 | (21.2) | |
4 | 0 | (0.0) | 2 | (0.0) | 0 | (0.0) | |
Diabetes mellitus, no. (%) | 17 | (8.8) | 734 | (14.6) | 114 | (28.4) | < 0.001 |
Hemodialysis, no. (%) | 9 | (4.6) | 96 | (1.9) | 9 | (2.2) | 0.029 |
Rheumatoid arthritis, no. (%) | 5 | (2.6) | 74 | (1.5) | 5 | (1.2) | 0.421 |
Smoking, no. (%) | 18 | (9.3) | 630 | (12.5) | 74 | (18.5) | < 0.001 |
Steroid use, no. (%) | 6 | (3.1) | 134 | (2.7) | 13 | (3.2) | 0.752 |
Surgery procedure, no. (%) | |||||||
Laminectomy | 60 | (30.9) | 2171 | (43.2) | 180 | (44.9) | 0.006 |
Herniotomy | 69 | (35.6) | 1414 | (28.1) | 121 | (30.2) | |
Post. fixation | 65 | (33.5) | 1442 | (28.7) | 100 | (24.9) | |
Revision surgery, no. (%) | 19 | (9.8) | 580 | (11.5) | 45 | (11.2) | 0.747 |
Microendoscopic, no. (%) | 92 | (47.4) | 2325 | (46.3) | 190 | (47.4) | 0.869 |
Mean OT in minutes (SD) | 124.8 | (82.1) | 130.5 | (84.5) | 149.3 | (114.1) | < 0.001 |
Mean EBL in mL (SD) | 141.4 | (300.1) | 140.9 | (252.0) | 188.2 | (302.3) | 0.002 |
