Published online by Cambridge University Press: 31 July 2008
The distribution of the interval between (say) first and third confinements is the product of the distributions of the intervals between first and second and second and third confinements provided these two confinement intervals are independent. In this paper we use some specially provided NSW data to consider the question of the independence of the intervals between various confinements. It is shown that there is some indication of a positive association between confinement intervals, but that this association is not very great.