Table 6 Among obese patients with preoperative impairment ≥ Minimal Clinical Important Difference (MCID), proportion of patients who improved by MCID or more after lumbar disc herniation (LDH) surgery in relation to by body mass index (BMI; g/cm2) class. Numbers of included patients for each variable are presented as n1 to n3. Data are presented as proportions (%) and Odds Ratio (OR), adjusted for age, smoking habits, and sex, with 95% confidence intervals within brackets. All ORs are calculated using the proportion that reached improvement ≥ MCID among obese class I patients as reference cohort. Statistically significant differences are bolded
Obese class I BMI 30.0–34.9 | Obese class II BMI 35.0–39.9 | Obese class III BMI ≥ 40.0 | Group comparison proportions improved ≥ MCID | |||
|---|---|---|---|---|---|---|
n1 = 1177 | n1 = 273 | n1 = 53 | ||||
n2 = 999 | n2 = 245 | n2 = 48 | ||||
n3 = 1297 | n3 = 292 | n3 = 56 | ||||
Proportions improved ≥ MCID | Proportions improved ≥ MCID | OR for gaining improvement ≥ MCID compared to reference cohort | Proportions improved ≥ MCID | OR for gaining improvement ≥ MCID compared to reference cohort | P-value | |
NRS leg pain (n = 1503)1 | 70% | 60% | 0.6 (0.5, 0.8) | 74% | 1.1 (0.6, 2.1) | < 0.01 |
NRS back pain (n = 1292)2 | 58% | 63% | 1.3 (0.9, 1.7) | 60% | 1.1 (0.6, 2.0) | 0.43 |
ODI (n = 1645)3 | 67% | 62% | 0.8 (0.6, 1.03) | 70% | 1.1 (0.6, 1.9) | 0.15 |