Abstract: Objective To investigate the prevalence and related factors of abnormal pelvic floor muscle strength and provide
theoretical evidence for the prevention and treatment of pelvic floor dysfunction. Methods A total of 1008 migrant women in
hospitals of Guangzhou and Foshan were screened for pelvic floor strength at 42 days postpartum from Oct, 2013 to July, 2014.
EMG biofeedback equipment was employed to assess the strength of type I and II muscle fiber and a questionnaire was
designed to record its related factors. Results The incidence of abnormal type I and II muscle fiber strength was 49.21% and
49.60%, respectively. No statistical significance was observed in the abnormal rates among women with different ages or
occupations. Compared with women who chose vaginal delivery, women with cesarean section had significantly reduced
abnormal rates. A negative correlation was found between parity and type I and II muscle fiber strength. Conclusion The
delivery mode and parity are factors affecting pelvic floor muscle strength among migrant women in the Pearl River Delta,
suggesting the necessity of health education and promotion of family planning policy.