Table 2.
Relationship between obesity and body composition and intensity of low back pain
| Male | Female | |||||||
|---|---|---|---|---|---|---|---|---|
| Number | Low-intensity pain | High-intensity pain | P between group | Number | Low-intensity pain | High-intensity pain | P between group | |
| OR (95% CI) | OR (95% CI) | variability (low/high) | OR (95% CI) | OR (95% CI) | variability (low/high) | |||
| Model 1 | ||||||||
| Obesity measures | ||||||||
| BMI (per 5 kg/m2) | 1 | 1.24 (1.07–1.44) | 1.42 (1.18–1.71) | 0.08 | 1 | 1.17 (1.05–1.30) | 1.43 (1.26–1.62) | <0.001 |
| Waist circumference (per 10 cm)a | 1 | 1.11 (0.98–1.26) | 1.26 (1.08–1.47) | 0.02 | 1 | 1.14 (1.04–1.25) | 1.38 (1.24–1.54) | <0.001 |
| Body composition measures | ||||||||
| Percent fat (per 10%) | 1 | 1.27 (1.08–1.49) | 1.45 (1.20–1.76) | 0.06 | 1 | 1.11 (1.00–1.23) | 1.41 (1.25–1.59) | <0.001 |
| Fat mass (per 10 kg)a | 1 | 1.10 (0.96–1.26) | 1.22 (1.04–1.42) | 0.01 | 1 | 1.10 (1.01–1.19) | 1.28 (1.16–1.41) | <0.001 |
| Fat-free mass (per 10 kg)a | 1 | 1.20 (0.98–1.48) | 1.20 (0.93–1.56) | 0.69 | 1 | 1.18 (0.94–1.48) | 0.72 (0.54–0.96) | <0.001 |
| Model 2 | ||||||||
| Obesity measures | ||||||||
| BMI (per 5 kg/m2) | 1 | 1.25 (1.07–1.45) | 1.41 (1.17–1.70) | 0.01 | 1 | 1.17 (1.05–1.30) | 1.39 (1.22–1.59) | <0.001 |
| Waist circumference (per 10 cm)a | 1 | 1.11 (0.98–1.27) | 1.25 (1.07–1.46) | 0.06 | 1 | 1.13 (1.03–1.24) | 1.36 (1.22–1.52) | <0.001 |
| Body composition measures | ||||||||
| Percent fat (per 10%) | 1 | 1.28 (1.09–1.51) | 1.45 (1.19–1.77) | 0.01 | 1 | 1.41 (1.25–1.59) | 1.39 (1.22–1.57) | <0.001 |
| Fat mass (per 10 kg)b | 1 | 1.11 (0.97–1.27) | 1.23 (1.05–1.44) | 0.18 | 1 | 1.28 (1.16–1.41) | 1.27 (1.15–1.40) | <0.001 |
| Fat-free mass (per 10 kg)b | 1 | 1.19 (0.97–1.47) | 1.15 (0.88–1.50) | 0.77 | 1 | 0.72 (0.54–0.96) | 0.75 (0.56–1.01) | <0.001 |
Model 1: adjusted for age, education, smoking status, Socio-Economic Indexes for Areas (SEIFA), model 2: all the variables in model 1 and mental component score of SF-36
OR odds ratio, CI confidence level, BMI body mass index
aAdjusted for fat-free mass
bCo-adjusted for each other