Table 4 Crude and adjusted odds ratios of serum lipids for low back pain by sex
| Â | Total | Low back pain | Crude | Adjusteda | ||
|---|---|---|---|---|---|---|
N | n (%) | OR | 95%CI | OR | 95%CI | |
Men | ||||||
 LDL-C (mg/dL) | ||||||
  Normal (<  140) | 119,824 | 2605 (2.2) | 1.00 |  | 1.00 |  |
  High (≥ 140) | 49,782 | 1121 (2.3) | 1.04 | 0.97–1.11 | 1.04 | 0.96–1.11 |
 HDL-C (mg/dL) | ||||||
  Normal (≥ 40) | 154,412 | 3294 (2.1) | 1.00 |  | 1.00 |  |
  Low (<  40) | 15,194 | 432 (2.8) | 1.34 | 1.21–1.49 | 1.34 | 1.20–1.48 |
 LDL-C/HDL-C ratio | ||||||
  Low (<  2.5) | 105,067 | 2178 (2.1) | 1.00 |  | 1.00 |  |
  High (≥ 2.5) | 64,539 | 1548 (2.4) | 1.16 | 1.09–1.24 | 1.17 | 1.09–1.26 |
Women | ||||||
 LDL-C (mg/dL) | ||||||
  Normal (<  140) | 63,407 | 1278 (2.0) | 1.00 |  | 1.00 |  |
  High (≥ 140) | 25,354 | 611 (2.4) | 1.20 | 1.09–1.32 | 1.02 | 0.92–1.13 |
 HDL-C (mg/dL) | ||||||
  Normal (≥ 40) | 86,920 | 1828 (2.1) | 1.00 |  | 1.00 |  |
  Low (<  40) | 1841 | 61 (3.3) | 1.59 | 1.23–2.07 | 1.32 | 1.02–1.72 |
 LDL-C/HDL-C ratio | ||||||
  Low (<  2.5) | 70,748 | 1398 (2.0) | 1.00 |  | 1.00 |  |
  High (≥ 2.5) | 18,013 | 491 (2.7) | 1.39 | 1.25–1.54 | 1.15 | 1.03–1.29 |