Recruitment of participants and randomization
An official permission was obtained from the administrative authorities of Qasr-al Aini maternity hospital of
Cairo University for conducting this study. Identifying the random sample was done on the admission of women
through the following three steps; First, identifying total number of women who admitted in labor and delivery
unit in one day from admission registration notebook. Then determining the hospital numbers wrote on the main
admission paper. Second, limiting the number of mothers in term of who were met the inclusion criteria. Third,
ordering the hospital numbers, woman who had an even number on her admission paper was included in the
study. While random assignment to the study and the control group achieved by withdraw the sealed envelopes
contain numbers from one to one hundred. Formal consent was signed ensuring that all data obtained were to be