Purpose: The aim of this study is to estimate the compound categories and the subgroups of the independent variables in order to reach the factors affecting families who wanted to give a birth by CHAID analysis. Materials-Methods: One of the important statistical problem in scientific studies is determining the factors that are mostly affecting the concerning phenomenon or in which level these factors have the highest effect. CHAID (chi-squared automatic interaction detection) analysis was developed as a method which determines the combinations or interactions among the variables. The method, is a technique that repeatedly partitioning the population into different subgroups or segments where the variation of dependent variable is minimum within the groups and maximum between the groups. In this study, the information of 400 women who wanted to give a birth and who came to Afyon Kocatepe University hospital in the period of January-May 2001 was used. Result-Conclusion: The factor affecting the desire to give a birth to a great extend was estimated the number of alive children. The less the number of alive children, the more the number of planned children. The more the number of the planned children, the more the amount of dead birth and miscarriage and so the more the number of abortion. The package program of ANSWERTREE 1.0 was used to apply the method.