Since the cancellation of compulsory premarital check-ups in city B in 2003, the city's premarital check-up rate has fallen from nearly 100% 10 years ago to 7% in 2011, and it is the lowest in the country  At the same time, the incidence of birth defects in the city has doubled
Has there been a substantial increase in unhealthy lifestyles such as staying up late and surfing the Internet for a long time among people of childbearing age in the city in the past decade.
 Thus it can be seen that the abolition of the compulsory premarital examination system has led to an increase in the rate of birth defects