Material and Method
The present study was a cross-sectional descriptive study. Women were recruited from the Family Planning Clinic King Chulalongkorn Memorial Hospital from May 2006 to July 2006. Participants were selected randomly from scheduled postpartum visits. The proposal and questionnaires were reviewed and approved by the ethical committee of the faculty of medicine, Chulalongkorn University. Sample size was calculated after pilot study was done with this formula;