Oobjectives: To evaluate the effectiveness of a program aiming to decrease the sex ratio at birth in 3 districts of Sac Giang province. Subjects and methods: Group-based intervention with pre- and postcomparison on 400 couples who gave birth from May to the end of August 2013, in 3 districts Luc Nam, Lang Giang, and Viet Yen districts of Sac Giang province. Results: The knowledge about the consequence of having more boys than girls (making men difficult to find their partners) increased by 8.1 percent
the prevalence of subjects thinking that sex-ratio imbalance did not influence the society reduced by 8.3 percent. Attitude: Prevalence of respondents who wanted to have a son decreased by 14.6 percent and that of those who had no concerns about gender of the baby increased by 5.8 percent. Practice: the prevalence of respondents utilizing the fetal sex selections in the nearest birth decreased by 9.2 percent. Sex ratio at birth in Sac Giang province decreased 2.3 percentage points
Sex ratio at birth in all three districts decreased in all birth-orders.