Table 3 Comparison of NRS, EQ-5D, ODI, and postoperative satisfaction in the low, normal, and high BMI groups after adjustment by inverse probability weighting method.
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 | p | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
L vs. N | L vs. H | N vs. H | |||||||||
NPRS, no. of patients (%) | 121 | (3.1) | 3460 | (87.7) | 366 | (9.3) | |||||
Lower back, mean (SD) | Pre | 4.7 | (3.1) | 5.5 | (3.0) | 6.4 | (3.0) | < 0.001 | 0.088 | < 0.001 | < 0.001 |
Post | 2.6 | (2.6) | 2.9 | (2.6) | 2.9 | (2.9) | 0.524 | ||||
Buttock, mean (SD) | Pre | 4.0 | (3.4) | 5.0 | (3.4) | 4.9 | (3.3) | 0.002 | 0.001 | 0.024 | 0.712 |
Post | 1.3 | (2.3) | 1.5 | (2.4) | 1.5 | (2.6) | 0.551 | ||||
Leg, mean (SD) | Pre | 5.8 | (3.4) | 6.1 | (3.1) | 5.8 | (3.5) | 0.138 | |||
Post | 2.0 | (2.6) | 2.4 | (2.8) | 3.0 | (3.2) | < 0.001 | 0.153 | 0.001 | < 0.001 | |
Plantar, mean (SD) | Pre | 2.2 | (2.9) | 2.3 | (3.0) | 1.9 | (3.0) | 0.076 | |||
Post | 1.4 | (2.3) | 1.3 | (2.3) | 1.2 | (2.2) | 0.934 | ||||
Achievement of 50% relief, no. (%) | |||||||||||
Lower back | 72 | (59.5) | 1955 | (56.5) | 229 | (62.6) | 0.072 | ||||
Buttock | 94 | (77.7) | 2653 | (76.7) | 283 | (77.5) | 0.912 | ||||
Leg | 93 | (76.9) | 2324 | (67.2) | 218 | (59.6) | < 0.001 | 0.077 | 0.002 | 0.010 | |
Plantar | 84 | (69.4) | 2504 | (72.4) | 275 | (75.1) | 0.391 | ||||
EQ-5D, no. (%) | 128 | (3.2) | 3564 | (88.1) | 354 | (8.7) | |||||
Pre | 0.54 | (0.20) | 0.54 | (0.17) | 0.55 | (0.14) | 0.599 | ||||
Post | 0.73 | (0.18) | 0.75 | (0.19) | 0.75 | (0.20) | 0.096 | ||||
Post–Pre | 0.19 | (0.27) | 0.21 | (0.23) | 0.20 | (0.22) | 0.136 | ||||
ODI, no. (%) | 124 | (3.2) | 3434 | (87.9) | 349 | (8.9) | |||||
Pre | 44.0 | (19.4) | 44.0 | (18.9) | 46.9 | (16.6) | 0.047 | 0.989 | 0.304 | 0.037 | |
Post | 21.4 | (16.7) | 19.5 | (18.0) | 21.2 | (19.1) | 0.176 | ||||
Post–Pre | − 22.6 | (20.1) | − 24.4 | (21.8) | − 25.7 | (22.2) | 0.358 | ||||
Satisfaction, no. (%) | |||||||||||
Satisfied | 114 | (89.1) | 2836 | (82.1) | 296 | (82.7) | 0.126 | ||||
Not satisfied | 14 | (10.9) | 618 | (17.9) | 62 | (17.3) | |||||
