Normal Ranges of Embryonic Length, Embryonic Heart Rate ...

ted separately to the mean and standard deviation (SD) as func-tions of GA or CRL. The 5th and 95th centiles were calculated as the mean 8 1.645 SD, with the value of 1.645 derived from the theoretical normal distribution. T he statistical software package SPSS 15.0 (SPSS Inc., Chicago, Ill., USA) was used for the data analyses. R e s u l t s ................
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