Relationship between the school bag weight and back pathology
| Variable | Back pathology n (%) | OR (CI 95%) | |
|---|---|---|---|
| No | Yes | ||
| School bag weight | |||
| First quartile | 297 (23.7) | 34 (22.8) | 1 |
| Second quartile | 325 (25.9) | 40 (26.8) | 1.2 (0.7 to 1.9) |
| Third quartile | 311 (24.8) | 32 (21.5) | 1.0 (0.6 to 1.7) |
| Fourth quartile | 321 (25.6) | 43 (28.9) | 1.4 (0.9 to 2.3) |
| Body mass index | |||
| First quartile | 321 (25.6) | 34 (22.8) | 1 |
| Second quartile | 307 (24.5) | 39 (26.2) | 1.1 (0.6 to 1.7) |
| Third quartile | 314 (25.0) | 39 (26.2) | 1.0 (0.6 to 1.6) |
| Fourth quartile | 312 (24.9) | 37 (24.8) | 1.0 (0.6 to 1.6) |
| Perform some type of sports activity | |||
| No | 584 (46.8) | 69 (46.3) | 1 |
| Yes | 664 (53.2) | 80 (53.7) | 1.2 (0.8 to 1.7) |
| Sex | |||
| Boy | 612 (48.8) | 61 (40.9) | 1 |
| Girl | 642 (51.2) | 88 (50.1) | 1.5 (1.0 to 2.2) |
| Age (continuous variable) | – | 1.3 (1.1 to 1.4) | |