Table 4. The prevalence of NLBP in students with regard to the perception of heaviness in carrying of schoolbags and students sex and age (n = 11,423).
| Perception of heaviness in carrying of schoolbags | All % | NLBP | |||
|---|---|---|---|---|---|
| with NLBP % | without NLBP % | ||||
| All | Heavy | 55.4 | 60.6 | 51.7 | |
| Adequate | 44.6 | 39.4 | 48.3 | ||
| Sex | Girls | ||||
| Heavy | 61.5 | 65.2 | 57.9 | ||
| Adequate | 38.5 | 34.8 | 42.1 | ||
| Boys | |||||
| Heavy | 48.1 | 52.1 | 46.2 | ||
| Adequate | 51.9 | 47.9 | 53.8 | ||
| Age | 10–11 years | ||||
| Heavy | 43.5 | 50.0 | 42.5 | ||
| Adequate | 56.5 | 50.0 | 57.5 | ||
| 12–13 years | |||||
| Heavy | 50.4 | 59.1 | 47.8 | ||
| Adequate | 49.6 | 40.9 | 52.3 | ||
| 14–15 years | |||||
| Heavy | 58.6 | 61.5 | 56.9 | ||
| Adequate | 41.4 | 38.5 | 43.1 | ||
| 16–17 years | |||||
| Heavy | 58.2 | 61.1 | 54.7 | ||
| Adequate | 41.8 | 38.9 | 45.3 | ||
| 18–19 years | |||||
| Heavy | 57.4 | 61.0 | 51.8 | ||
| Adequate | 42.6 | 39.0 | 48.2 | ||
Notes.
NLBP, non-specific low back pain.