The fertility, mortality and nuptiality of the Rungus Dusun

One of the authors, when holding the position of medical officer in Borneo carried out an intensive medical survey of the Rungus Dusun. The present paper records the results of analysing demographic data collected during this survey. The number involved was very small ; for instance, only 55 of the women were aged 15 years or over, and thus the findings are subject to considerable sampling error. In the circumstances, it is remarkable that the levels of fertility and mortality estimated to apply to different cohorts should be as consistent as they are. Sterility amongst the Dusun is shown to be reasonably low and fertility adequate. Such doubt as has been expressed as to their ability to survive is shown to derive from high mortality in infancy and early childhood. It is hoped that this study may make some contribution to the creation of an adequate body of techniques for studying the demography of such people.