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Health is universally regarded as an important index of human development. Improvements in health would translate into higher incomes, higher economic growth and accelerated declines of poverty. Without understanding the factors which play an important role in health care utilization, efforts to promote demand for health care will not offer a pragmatic solution. Increasing utilization of health services is the prime goal for many developing countries. In this study, potential biases are controlled by an advanced statistical technique. The results of this study can provide unbiased estimates...

During the last decades, a vertical exploration of statistical methodology in the ground of longitudinal data has been observed. One of the most exciting developments in this area is the Generalized Estimating Equation (GEE). This is a widely used approach that does not require the complete specification of the joint distribution of repeated measurements. In addition, GEE takes into account which results in attaining more efficiency in estimating parameters of marginal models. The model used in this study was developed by Barnhart & Williamson (1998). To test the goodness-of-fit we...