Table 1.
Schoolchildren distribution across four cities included in the study.
| City | n | % |
|---|---|---|
| Tepatitlan | 43 | 8.6 |
| Pachuca | 107 | 21.4 |
| Toluca | 112 | 22.4 |
| San Luis Potosí | 238 | 47.6 |
| 500 | 100 |
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