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Table 1 General characteristics of participants

From: Fat mass and fat distribution are associated with low back pain intensity and disability: results from a cohort study

Low back pain intensitya
  No intensity
n = 900
Low intensity
n = 3085
P
No vs low
High intensity
n = 1001
P
No vs high
Age at baseline, years 48.8 (11.1) 47.3 (10.9) 0.001 51.1 (11.8) <0.001
Female, n (%) 497 (55.2) 1682 (54.6) 0.75 598 (60.1) 0.03
Current smoker, n (%) 89 (10.1) 357 (11.2) 0.26 182 (18.6) <0.001
University degree, n (%) 354 (39.6) 1175 (38.4) 0.54 226 (22.9) <0.001
SEIFA (in lowest tertile), n (%) 258 (29.2) 918 (30.3) 0.86 397 (40.4) <0.001
MCS (SF-36) 51.0 (8.5) 48.9 (9.6) <0.001 46.3 (11.2) <0.001
BMI, kg/m2 26.0 (4.7) 26.6 (4.8) <0.001 27.8 (5.3) <0.001
Waist circumference, cm 87.9 (13.7) 89.5 (13.7) 0.002 92.7 (14.3) <0.001
Percent of fat (%) 31.7 (11.8) 32.6 (11.6) 0.03 36.2 (13.3) <0.001
Fat mass, kg 24.3 (12.4) 25.7 (12.4) 0.004 29.1 (14.6) <0.001
Fat-free mass, kg 50.6 (11.8) 51.4 (12.2) 0.10 49.3 (12.6) 0.03
Low back pain disabilityb
  No disability
n = 3,061
Low disability
n = 651
P
No vs low
High disability
n = 482
P
No vs high
Age at baseline, years 46.5 (10.7) 47.7 (11.5) 0.01 51.4 (10.9) <0.001
Female, n (%) 1650 (54.0) 352 (54.2) 0.94 61.6 (61.2) 0.002
Current smoker, n (%) 335 (11.1) 97 (15.6) 0.01 108 (23.1) <0.001
University degree, n (%) 1244 (41.0) 233 (36.1) 0.02 98 (20.6) <0.001
SEIFA (in lowest tertile), (%) 888 (29.5) 212 (33.0) 0.20 194 (41.0) <0.001
MCS (SF-36) 49.3 (9.2) 47.2 (10.6) <0.001 46.2 (11.7) <0.001
BMI, kg/m2 26.3 (4.7) 27.2 (5.0) <0.001 28.6 (5.8) <0.001
Waist circumference, cm 88.7 (13.5) 91.2 (13.4) <0.001 94.1 (14.9) <0.001
Percent of fat (%) 32.1 (11.5) 33.7 (12.6) 0.001 37.4 (13.3) <0.001
Fat mass, kg 25.0 (12.5) 27.2 (14.0) <0.001 30.6 (14.9) <0.001
Fat-free mass, kg 51.4 (12.3) 51.4 (12.3) 0.95 49.1 (12.5) <0.001
  1. SEIFA Socio-Economic Indexes for Areas, MCS mental component score, BMI body mass index
  2. aData were missing for 72 participants
  3. bData were missing for 864 participants