Table 4.
Adjusted analysis of factors associated to low back pain in the last 30 days among high school students from Pelotas, Brazil, 2009
| Variables | Adjusted analysis | |
|---|---|---|
| PR (95%CI) | p | |
| First level | 0.04* | |
| Skin color | ||
| White | 1.0 | |
| Non-white | 1.4 (1.0–1.9) | |
| Second level | ||
| Economic level | 0.09** | |
| A | 1.7 (0.6–4.9) | |
| B | 0.9 (0.3–2.3) | |
| C | 0.8 (0.3–2.2) | |
| D | 1.0 | |
| Third level | ||
| Transportation to school | 0.009* | |
| Walking | 1.0 | |
| Motorized | 0.6 (0.5–0.9) | |
PR prevalence ratios, 95%CI 95% confidence intervals, First level adjusted for skin color, age and gender, Second level adjusted for economic level and first-level variables, Third level adjusted for means of transportation to school, school chair comfort, daily hours of TV watching and computer use, and levels above
* Chi-square test for heterogeneity
** Wald’s test for linear trend