Table 4 Low back pain intensity and disability in relation to measures of sex-specific quartiles

   Body mass index

1

1.47 (1.14–1.88)

1.75 (1.36–2.25)

1.50 (1.16–1.93)

0.001

   Waist circumference^a

1

1.43 (1.10–1.84)

1.78 (1.36–2.34)

1.50 (1.12–2.00)

0.003

   Percent fat

1

1.58 (1.23–2.03)

1.64 (1.28–2.12)

1.61 (1.25–2.08)

<0.001

   Fat mass^b

1

1.78 (1.38–2.30)

1.91 (1.46–2.51)

1.51 (1.14–1.99)

0.02

   Fat-free mass^b

1

0.88 (0.68–1.14)

0.89 (0.68–1.16)

1.00 (0.76–1.33)

0.43

   Body mass index

1

1.25 (1.01–1.56)

1.25 (1.00–1.56)

1.92 (1.53–2.41)

<0.001

   Waist circumference^a

1

1.20 (0.96–1.50)

1.42 (1.13–1.78)

2.09 (1.65–2.65)

<0.001

   Percent fat

1

1.01 (0.81–1.26)

1.21 (0.96–1.51)

1.79 (1.42–2.24)

<0.001

   Fat mass^b

1

1.05 (0.84–1.32)

1.25 (1.00–1.57)

1.78 (1.42–2.24)

<0.001

   Fat-free mass^b

1

0.85 (0.68–1.06)

0.94 (0.75–1.17)

0.79 (0.63–0.99)

0.01

   Body mass index

1

1.12 (0.82–1.53)

1.13 (0.83–1.54)

1.31 (0.96–1.79)

0.001

   Waist circumference^a

1

1.59 (1.15–2.21)

1.29 (0.91–1.83)

1.85 (1.28–2.66)

0.003

   Percentage fat

1

1.12 (0.82–1.54)

1.20 (0.87–1.64)

1.37 (1.00–1.88)

0.04

   Fat mass^b

1

1.20 (0.87–1.66)

1.26 (0.90–1.76)

1.45 (1.02–2.05)

0.04

   Fat-free mass^b

1

1.00 (0.73–1.37)

0.75 (0.54–1.05)

0.78 (0.55–1.12)

0.07

   Body mass index

1

1.36 (1.01–1.83)

1.58 (1.18–2.12)

2.56 (1.93–3.40)

<0.001

   Waist circumference^a

1

1.16 (0.86–1.58)

1.53 (1.15–2.06)

2.50 (1.86–3.34)

<0.001

   Percent fat

1

1.08 (0.80–1.45)

1.49 (1.12–1.99)

2.15 (1.63–2.85)

<0.001

   Fat mass^b

1

1.07 (0.79–1.45)

1.37 (1.03–1.83)

2.30 (1.74–3.04)

<0.001

   Fat-free mass^b

1

1.20 (0.91–1.58)

1.16 (0.88–1.54)

.92 (0.69–1.22)

0.86