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50th and 90th percentile birthweight values were determined in the same way.
Median birthweight values of Japanese twins were compared with those of singletons derived from database in which birthweights were rounded to 10 g.
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To calculate the mean birthweight and the standard deviation, 50 grams were added to the recorded birth weight because birth weight is recorded every 100 grams, which does not exceed actual birthweight value.
For triplets and quadruplets, sample size was too small for calculation of birthweight percentile values by parity and also by gestational age less than 27 weeks.
In the sensitivity analysis conducted considering the low birthweight missing values as children with low birth weight, only number of prenatal care visits lost significance, while in the sensitivity analysis considering the low birth weight missing values as children with normal birthweight, there were no changes in association.
Figure 1 illustrates the 10th birthweight percentile value calculated from a histogram of birthweights from 38 cases of male triplets with gestation of 29 weeks.
To exclude unlikely values, birthweight by gestational age (GA) was compared to the expected value as calculated by the use of Marsal's charts of normal intrauterine growth [17].
Values in the data sets less than 500 or greater than 5500 were discarded since the 2- through 6-component models were meant to mimic a birthweight distribution; new values were drawn as needed to complete the data sets.
Most of the very low birthweight infants had negative values of this microbe, while the full-term infants had positive values.
Finally, a sensitivity analysis was conducted considering the missing values of low birthweight as low birthweight children and then considering the missing values as normal birthweight children.
Women with missing values on birthweight or gestational length were excluded (n = 3360).
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