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Table 2 Distribution of the patients according to the BMI subgroups

From: Obesity is associated with more disability at presentation and after treatment in low back pain but not in neck pain: findings from the OIOC registry

  LBP cross-sectional LBP longitudinal NP cross-sectional NP longitudinal
Patients: n 548 211 191 71
Underweight (BMI < 18 kg/m2): n (%) 11 (2)a 5 (2)a 6 (3)a 4 (6)a
Lean (BMI 18- < 25 kg/m2): n (%) 198 (36) 83 (39) 94 (49) 33 (46)
Overweight (BMI 25- <30 kg/m2): n (%) 194 (35) 79 (37) 61 (32) 24 (34)a
Obesity class I (BMI 30- < 35 kg/m2): n (%) 94 (18) 31 (15)a 22 (12)a 7 (10)a
Obesity class II–III (BMI ≥ 35 kg/m2): n (%) 51 (9) 13 (6)a 8 (4)a 3 (4)a
  1. agroups that did not meet the calculated sample size for sub-group analysis of 33 patients (power of 80 %, level of significance of 5 %)