The method of supposed birth weight of newborn infant has been many studied from before. Recently there is report such as ultrasonic studies, but none of the exact and simple method has appeared as yet. We think of height of uterine fundus, abdominal circumference that take in periodically check test of pregnant woman as variable number, used a computer and look for the multiple regression line and made the simple chart of supposed weight of newborn infant.
As the result, if the weight of newborn infant is Y, the height of uterine fundus is X
1, and the abdominal circumference is X
2.
1) In Y correlated with X
1, the correlation coefficient is 0.51, the regression line is calculated as Y=95.201X
1+75.485. 2) In Y correlated with X
2, the correlation coefficient is 0.46, the regression line is calculated as Y=36.116X
2-80.356. 3) In Y correlated with X
1 and X
2, the multiple correlation coefficient is 0.58, the multiple regression line is calculated as Y=-1370.8+71.488X
1+24.258X
2. 4) The maternal body weight increase in 10 kg in proportion to 225g of the weight of newborn infant. 5) The mean of weight of newborn infant is 3250±415g (M±SD), the mean of height of uterine fundus is 33.3±2.2cm (M±SD), and the mean of abdominal circumference is 92.2±5.2cm (M±SD), in the weight of newborn infant M±3/2SD is ranged from 2628 to 3873g, in the height of uterine fundus M± 3/2SD is ranged from 30.0 to 36.6 cm, in the abdominal circumference M±3/2SD is ranged from 84.4 to 100.0cm, therefore we think that within the limits of M±3/2SD means AFD. 6) When an error of the supposed weight and the birth weight of newborn infant is±100g, precise ratio is 26%, ±200g is 50%, ±300g is 69%, ±400g is 80%, }500g is 90%.
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