Table 9.7 is from a longitudinal study of coronary risk factors in school children. A sample of children aged 10–13 were classified by gender and by relative weight (O =

obese, N = not obese) at the first observation, two years later, and four years later.

Analyze these data. Summarize results in a short report.

Table 9.7 Children classified by gender and relative weight.

Responses in Three Years Gender NNN NNO NON NOO ONN ONO OON OOO Male 119 7 8 3 13 4 11 16 Female 129 8 7 9 6 2 7 14 Source: From R.F. Woolson and W.R. Clarke, J. Roy. Statist. Soc. A 147: 87–99 (1984). Reproduced with permission from the Royal Statistical Society, London.