These data are from Potthoff and Roy (1964).  An orthodontic study was
conducted on 27 children, 11 girls and 16 boys, who were all of age 8
at the beginning of the study.  On each child, the distance from the 
center of the pituitary to the pteryomaxillary fissure was measured (in
mm) every two years through age 14.  The study objectives were to 
determine if the distances are larger for boys than for girls and if
the rate of change of distance differs between boys and girls.

Potthoff and Roy (1964). A generalized multivariate analysis of
variance model useful especially for growth curve problems. Biometrika,
51: 313-326.

These data made available courtesy of Dr. Marie Davidian, Biostatistics,
North Carolina State University.