Table 3 Relationship between obesity and body composition and low back disability

  BMI (per 5 kg/m²)

1

1.04 (0.88–1.22)

1.44 (1.20–1.74)

0.002

1

1.25 (1.13–1.39)

1.49 (1.33–1.66)

0.01

  Waist circumference (per 10 cm)^a

1

1.15 (1.00–1.32)

1.36 (1.17–1.61)

0.05

1

1.23 (1.12–1.35)

1.39 (1.27–1.54)

0.03

  Percent fat (per 10%)

1

1.12 (0.94–1.34)

1.42 (1.14–1.77)

0.05

1

1.21 (1.08–1.35)

1.52 (1.35–1.72)

0.002

  Fat mass (per 10 kg)^b

1

1.08 (0.94–1.24)

1.30 (1.11–1.52)

0.03

1

1.18 (1.09–1.28)

1.34 (1.23–1.47)

0.02

  Fat-free mass (per 10 kg)^b

1

0.92 (0.73–1.17)

0.86 (0.65–1.14)

0.66

1

1.05 (0.82–1.33)

0.89 (0.69–1.16)

0.28

  BMI (per 5 kg/m²)

1

1.02 (0.86–1.21)

1.39 (1.15–1.68)

0.004

1

1.25 (1.12–1.39)

1.45 (1.29–1.62)

0.02

  Waist circumference (per 10 cm)^a

1

1.13 (0.98–1.30)

1.32 (1.12–1.56)

0.08

1

1.23 (1.11–1.35)

1.37 (1.23–1.52)

0.04

  Percent fat (per 10%)

1

1.11 (0.92–1.32)

1.37 (1.10–1.72)

0.07

1

1.20 (1.07–1.35)

1.48 (1.31–1.68)

0.004

  Fat mass (per 10 kg)^b

1

1.07 (0.93–1.23)

1.28 (1.09–1.51)

0.04

1

1.18 (1.09–1.28)

1.32 (1.21–1.45)

0.04

  Fat-free mass (per 10 kg)^b

1

0.93 (0.73–1.18)

0.85 (0.63–1.13)

0.61

1

1.09 (0.85–1.39)

0.93 (0.72–1.22)

0.29