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Table 4 Body composition and exercise performance on the Six Minute Walk Test among patients with COPD

From: Body composition and functional limitation in COPD

Measure of body composition Age adjusted Age, height, FEV1/FVC adjusted Age, height, FEV1/FVC, race, education, and smoking adjusted
  Mean meters (95% CI) Mean meters (95% CI) Mean meters (95% CI)
MEN (n = 143)    
Lean/fat ratio 39 (9 to 69) 42 (11 to 72) 40 (9 to 71)
SAD -29 (-42 to -15) -34 (-47 to -20) -34 (-48 to -19)
BMI    
Normal weight Referent Referent Referent
Overweight 27 (-171 to 225) -28 (-225 to 169) -88 (-295 to 120)
Obese -264 (-431 to -97) -263 (-431 to -95) -269 (-451 to -87)
WOMEN (n = 212)    
Lean/fat ratio 140 (82 to 199) 159 (96 to 223) 162 (97 to 228)
SAD -34 (-43 to -24) -38 (-48 to -28) -39 (-49 to -28)
BMI    
Normal weight Referent Referent Referent
Overweight -42 (-202 to 117) -56 (-217 to 106) -49 (-214 to 115)
Obese -340 (-462 to -218) -392 (-521 to -262) -398 (-531 to -264)
  1. Results are from separate multivariate linear regression of distance in meters walked in 6 minutes regressed on body composition measures plus covariates.
  2. Lean/fat ratio = derived from bioelectrical impedance. Results are expressed per 0.50 increment in the ratio.
  3. SAD = sagittal abdominal diameter, an estimate of visceral fat. Results are expressed per 1 cm increment.
  4. BMI = body mass index, an estimate of adiposity; normal weight (18.5 to 24.9 kg/m2) overweight = 25.0 to 29.9 kg/m2, obese = 30.0 kg/m2 or greater; only 9/355 (2.5%) of subjects were in underweight category (< 18.5 kg/m2) so these were included in the normal weight group