Load dataset

## 'data.frame':    25 obs. of  3 variables:
##  $ Age     : num  9.21 10.21 10.58 10.83 11.08 ...
##  $ Total   : num  376 200 93 120 90 88 105 111 100 93 ...
##  $ Menarche: num  0 0 0 2 2 5 10 17 16 29 ...

Age: Average age of the group. (The groups are reasonably age homogeneous.)

Total: Total number of children in the group.

Menarche: Number who have reached menarche