4. Statistical MethodsData was anal

4. Statistical Methods
Data was analyzed using SPSS version 16 for windows (SPSS Inc., Chicago, IL, USA). Descriptive analysis was performed to obtain mean, standard deviation, and percentile values for AFI from 34 to 40 weeks. Microsoft Excel 2010 was used to plot percentile values (5th, 50th, and 95th) across various gestational ages. A polynomial regression analysis of 3rd order was used to find the best fit.The decline in AFI value was calculatedatweekly interval and themagnitudeof changewas analyzed by effect size estimation (Cohen