In order to study the effect of socio-economic status on the birth-weight of Saudi newborns, we studied a random sample of 4498 pregnant Saudi women from four major hospitals in Riyadh, Saudi Arabia. Birth weight (4000 g). Measure of the socio-economic status was based on the family income, since in Saudi Arabia this is the most potent indicator which affects living standards.The results indicate that there is a direct correlationship between family income and birth weight (P<0.001,χ2t
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