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Table 3 Among patients with a 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 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 normal weighted patients as reference cohort. Statistically significant differences are bolded

From: A study comparing outcomes between obese and nonobese patients with lumbar disc herniation undergoing surgery: a study of the Swedish National Quality Registry of 9979 patients

 

Normal weight

BMI (18.5–24.9)

Overweight

BMI (25.0–29.9)

Obese

BMI (≥ 30.0)

Group comparison proportions improved ≥ MCID

n1 = 3548

n1 = 3409

n1 = 1503

 

n2 = 2721

n2 = 2760

n2 = 1292

 

n3 = 3826

n3 = 3731

n3 = 1645

 

Proportions improved ≥ MCID

Proportions improved ≥ MCID

OR for gaining improvement ≥ MCID compared to the reference cohort

Proportions improved ≥ MCID

OR for gaining improvement ≥ MCID compared to the reference cohort

P-value

NRS leg pain (n = 8460)1

77%

73%

0.8 (0.7, 0.90)

69%

0.7 (0.6, 0.8)

 < 0.001

NRS back pain (n = 6773)2

62%

61%

0.9 (0.8, 1.04)

59%

0.8 (0.9, 1.01)

0.27

ODI (n = 9202)3

71%

69%

0.9 (0.8, 0.97)

66%

0.8 (0.7, 0.91)

 < 0.01