Table 3.
Low back pain in the last 30 days among high school students from Pelotas (Brazil) and its distribution according to ergonomic and behavioral variables, 2009
| Variables | Acute low back pain prevalence | Crude analysis prevalence ratios (95%CI) | p | |
|---|---|---|---|---|
| N | % | |||
| Commuting to school (n = 1,180) | 0.02* | |||
| Active | 96 | 16.2 | 1.0 | |
| Inactive | 68 | 11.6 | 0.7 (0.5–1.0) | |
| Backpack user (n = 1,233) | 0.1* | |||
| Yes | 140 | 13.2 | 1.4 (0.9–2.0) | |
| No | 28 | 17.7 | 1.0 | |
| Backpack weight (kg) (n = 1,233) | 0.3* | |||
| Lighter than 2.00 | 17 | 9.9 | 1.0 | |
| 2.00–3.99 | 108 | 14.8 | 1.5 (0.8–2.2) | |
| 4.00–5.99 | 36 | 12.9 | 1.3 (0.8–2.2) | |
| Heavier than 6.00 | 5 | 20.0 | 2.0 (0.8–5.0) | |
| Comfortable chair/adequate height (n = 1,232) | 0.01* | |||
| No | 96 | 18.4 | 1.0 | |
| Yes | 73 | 11.3 | 0.7 (0.5–0.9) | |
| Daily hours watching TV (n = 1,152) | 0.2** | |||
| Less than 2.00 | 72 | 14.7 | 1.0 | |
| 2.00–4.59 | 65 | 13.10 | 0.9 (0.7–1.2) | |
| >5.00 | 18 | 10.8 | 0.7 (0.5–1.2) | |
| Daily hours using computer (n = 1,063) | ||||
| Less than 2.00 | 47 | 11.8 | 1.0 | 0.3** |
| 2.00–4.59 | 65 | 14.6 | 1.2 (0.9–1.8) | |
| >5.00 | 31 | 14.2 | 1.2 (0.8–1.8) | |
* Chi-square test for heterogeneity
** Wald’s test for linear trend