The required sample size has been calculated using IBM© Sample Power© version 3 .The primary outcome measure is the prevalence of stress urinary incontinence (SUI) in the 1st and 3rd trimesters.~Accordingly, it is estimated that a sample of 240 patients in either study group would have a power of 80% (beta error, 0.2) to detect a statistically significant difference of 9% between the two groups as regards the incidence of SUI.~The incidence of SUI is assumed to equal 10% in the 1st trimester. The prevalence of SUI in the 3rd trimester is assumed to equal 10% under the null hypothesis and to equal 19% under the alternative hypothesis.~This calculation used a two-sided z test with a confidence level of 95% (alpha error, 0.05).~Data will be collected, tabulated, then analyzed using IBM© SPSS© Statistics version 22.~Normally distributed numerical data will be presented as mean and SD, and skewed data as median and inter-quartile range.~Qualitative data will be presented as number and percentage.Comparison of normally distributed numerical data will be done using the unpaired Student t test. Skewed data will be compared using the Mann-Whitney U test.~Categorical data will be compared using the chi-squared test, or Fisher's exact test when appropriate.~A two-sided p-value <0.05 will be considered statistically significant .
Stress urinary incontinence is the most common type of incontinence during pregnancy.our study aims at determining the prevalence in the first and third trimesters and the associated risk factors.