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Polydimensional retrospective studies were conducted into correlations between interruption of pregnancy, abortion, and premature birth of infants weighing less than 2,501 g, on the one hand, and the general phenomenon of low birth weight, on the other. Reference was made to parity. The studies were undertaken over a period between 1969 and 1977. The birth total investigated was 17,076, stillbirths and twins excluded.-The impact of all factors involved as well as the statistical significance were tested and verified by calculation of information measure 2-I, followed by an approximative chi 2-test. The results suggested that the parameters studied were of somewhat staggered impact upon low birth weight. Premature birth, interruption of pregnancy, and abortion was the order of impact at all parity levels studied.
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