A Cross-sectional Study of Female Pelvic Floor Muscle Function in Chinese Healthy Female

Inclusion Criteria: Group A：Premenopausal women without history of abortion or delivery 1. Having sex life and tolerable to vaginal examination 2. Premenopausal women without history of abortion over 16 weeks 3. Premenopausal women without history of childbirth 4. Planning to live locally for a long time Group B：Premenopausal women with childbirth 1. Having sex life and tolerable to vaginal examination 2. Premenopausal women with childbirth (including cesarean section or natural birth). 3. Planning to live locally for a long time Group C:Postmenopausal women (over a year, except surgical menopause) 1. Having sex life and tolerable to vaginal examination 2. Postmenopausal women 3. Planning to live locally for a long time Exclusion Criteria: 1. Incontinence 4 weeks before enrollment 2. History of fecal incontinence 3. Prolapse beyond the level of the hymen 4. History of radical operation of pelvic cavity(cervical cancer,rectal cancer,bladder cancer, ect） 5. History of pelvic radiotherapy 6. History of pelvic floor surgery 7. History of abortion over 16 weeks' pregnancy or in 1 year after delivery 8. Duration of pregnancy 9. Duration of lactation 10. History of hysterectomy 11. Latex allergy 12. Colpitis