The survey, which was conducted by the All-China Women's Federation in 2006, also shows that only 12.8 percent of employers cover hospital costs when their migrant worker employee gives birth.

Among the companies which offer maternity leave, 14.4 percent claimed they give full pay, 21.1 percent pay part of the new-mother's wage, while around 64 percent of employers did not provide paid maternity leave to migrant workers, according to the survey.

The survey also showed that 68. 2 percent of women living in rural areas and 62.3 percent rural migrant workers were provided prenatal examinations, up markedly from figures in previous surveys.