Table 2 Pre- and one-year postoperative data and improvement from before to one year after surgery in Numeric Rating Scale (NRS) leg pain, NRS back pain, and Oswestry Disability Index (ODI) in patients with lumbar disc herniation (LDH) surgery in relation to body mass index (BMI; g/cm2) class. Number of included patients for each variable are presented as n1 to n3. Data are presented as means ± standard deviations and as mean differences, adjusted for age, smoking habits, sex, and baseline value for the evaluated variable, with 95% confidence intervals within brackets. Statistically significant differences are bolded
Normal weight BMI 18.5–24.9 | Overweight BMI 25.0–29.9 | Obese BMI ≥ 30.0 | Group comparison improvement | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
n1 = 4032 | n1 = 3896 | n1 = 1690 | ||||||||
n2 = 4029 | n2 = 3894 | n2 = 1692 | ||||||||
n3 = 4032 | n3 = 3900 | n3 = 1694 | ||||||||
Pre-operative | Post-operative | Improvement* | Pre-operative | Post-operative | Improvement* | Pre-operative | Post-operative | Improvement* | P-value | |
NRS leg pain (n = 9618)1 | 6.7 ± 2.4 | 1.9 ± 2.5 | 4.8 (4.7, 4.9) | 6.7 ± 2.5 | 2.1 ± 2.7 | 4.5 (4.5, 4.6) | 6.8 ± 2.4 | 2.5 ± 2.9 | 4.3 (4.2, 4.4) | < 0.001 |
NRS back pain (n = 9615)2 | 4.5 ± 2.9 | 2.3 ± 2.6 | 2.3 (2.3, 2.4) | 4.7 ± 2.9 | 2.5 ± 2.6 | 2.1 (2.0, 2.2) | 5.1 ± 2.9 | 2.9 ± 2.8 | 1.9 (1.8, 2.1) | < 0.001 |
ODI (n = 9617)3 | 47 ± 19 | 18 ± 17 | 30 (30, 31) | 47 ± 18 | 19 ± 17 | 29 (28, 29) | 51 ± 18 | 23 ± 19 | 26 (25, 27) | < 0.001 |