front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |review

Fig. 8. Progreso boys have a curve, whereas the girls have the expected linear slope at 7-13 years of age. This curve is very weak as seen by its low F ratio of 43.