Maternal depression and loss of children under the one-child family planning policy in China: a cross-sectional study of 300 000 women.

People in the FP group, especially those who lost their only child, are more susceptible to MDD than their counterparts in the non-FP group. Mental health programmes should give special care to those who lost their only child and take existing social policies and norms, such as FP policies, into consideration.