Table 2.
Characteristics in each group stratified by the presence of low back pain (LBP), and comparison between women with and those without LBP. Values of continuous variables are expressed as mean±SD, and those of dichotomous variables are expressed as percentages
| Group 1 | Group 2 | Group 3 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| (age 25–44) | (age 45–64) | (age 65–) | |||||||
| LBP(−) | LBP(+) | P | LBP(−) | LBP(+) | P | LBP(−) | LBP(+) | P | |
| (n=593) | (n=126) | Value | (n=858) | (n=295) | Value | (n=270) | (n=102) | Value | |
| Age (years) | 36.1±5.5 | 37.4±4.6 | 0.02 | 55.0±5.8 | 55.1±5.8 | 0.86 | 69.0±3.7 | 69.7±4.1 | 0.08 |
| Height (cm) | 155.9±5.1 | 156.4±5.2 | 0.31 | 152.8±4.8 | 152.8±5.1 | 0.91 | 149.8±4.9 | 149.5±6.0 | 0.24 |
| Weight (kg) | 52.3±7.1 | 52.9±8.0 | 0.37 | 53.3±6.9 | 53.3±6.9 | 0.84 | 51.0±7.5 | 51.6±6.1 | 0.45 |
| BMI (kg/m2) | 21.5±2.8 | 21.6±2.7 | 0.76 | 22.8±2.7 | 22.8±2.7 | 0.92 | 22.7±3.0 | 23.1±2.4 | 0.24 |
| BMD (g/cm2) | 0.655±0.049 | 0.653±0.047 | 0.61 | 0.570±0.083 | 0.583±0.075 | 0.02 | 0.466±0.071 | 0.461±0.069 | 0.52 |
| Exercise (≥3 h per week) (%) | 7.9 | 5.6 | 0.37 | 10.5 | 6.2 | 0.02 | 12.3 | 12.0 | 0.94 |
| Physical labor (%) | 7.6 | 10.4 | 0.30 | 17.9 | 19.0 | 0.65 | 13.3 | 15.8 | 0.54 |
| Smoking (%) | 6.4 | 6.4 | 0.99 | 2.1 | 4.1 | 0.07 | 1.1 | 3.9 | 0.08 |
| Drinking (%) | 33.6 | 32.8 | 0.87 | 25.1 | 25.4 | 0.91 | 13.3 | 20.6 | 0.08 |