5Bernazzani O, Bifulco A. Motherhood as a vulnerability factor in major depression:the role of negative pregnancy experiences. Soc Sci Med. 2003,566 : 1249.
6Carol Joinson. Timing of menarche and depressive symptoms in ad- olescent girls from a UK cohort[ J]. The British Journal of Psychia- try: The Journal of Mental Science, 2011,198 ( 1 ) : 17 - 23.
7Lien L, Dalgard F, Heyardahl S, et al. The relationship between age of menarehe and mental distress in Norwegian adolescent girls and girls from different immigrant groups in Norway : Results from an urban city cross - sectional survey[J ]. Social Science & Medi- cine, 2006,63 ( 2 ) : 285.
8Bemazzani O, Bifulco A. Motherhood as a vulnerability factor in major depression : the role of negative pregnancy experiences [ J ]. Social Science&Medicine,2003,56 (6) : 1249 - 1260.
9Beck CT. Predictors of postpartum depression : an update [ J ]. Nurse Rec ,2001,50(5 ) :275 - 85.