Table 3. Multivariable-adjusted odds ratios for incidence of persistent low back pain according to body fat percentage and body mass index (quartiles).
| Q1 (lowest) | Q2 | Q3 | Q4 (highest) | p for linearity | |
|---|---|---|---|---|---|
| Body fat percentage (%) | ≤12 | 13–14 | 15–17 | ≥18 | |
| n | 335 | 282 | 295 | 240 | |
| Men-years of follow-up | 7,705 | 6,486 | 6,785 | 5,520 | |
| Persistent LBP per 10,000 men-years | 27 | 23 | 37 | 53 | |
| Age-adjusted odds ratio (95% CI) | 1.00 (reference) | 0.85 (0.43–1.68) | 1.41 (0.77–2.58) | 2.10 (1.16–3.78) | ** |
| Multivariable-adjusteda odds ratio (95% CI) | 1.00 (reference) | 0.86 (0.43–1.71) | 1.46 (0.79–2.72) | 2.12 (1.13–3.98) | * |
| Body mass index (kg/m2) | ≤20.81 | 20.82–22.30 | 23.31–24.05 | ≥24.06 | |
| n | 285 | 290 | 289 | 288 | |
| Men-years of follow-up | 6,555 | 6,670 | 6,647 | 6,624 | |
| Persistent LBP per 10,000 men-years | 26 | 33 | 33 | 44 | |
| Age-adjusted odds ratio (95% CI) | 1.00 (reference) | 1.31 (0.68–2.52) | 1.37 (0.71–2.65) | 1.86 (0.99–3.49) | ** |
| Multivariable-adjusteda odds ratio (95% CI) | 1.00 (reference) | 1.32 (0.68–2.55) | 1.37 (0.71–2.68) | 1.74 (0.89–3.39) | * |
aAdjusted for age, drinking, smoking, and maximal oxygen uptake.
*p<0.05, **p<0.01
CI: confidence interval