The purpose of this study is to integrate millimeter-wave radar technology to investigate the dynamic movement characteristics of the pelvic floor muscles in patients with different Body Mass Index (BMI) and stress urinary incontinence. Based on this, a large database of pelvic floor movement parameters for Chinese women will be constructed, and a multi-subgroup standard atlas of pelvic floor muscle movement will be established to promote the standardized application of this technology in obstetrics and gynecology clinical assessments. This study also aims to explore the clinical value of pelvic floor movement assessment within the pelvic floor evaluation system, providing directions and insights for establishing a systematic evaluation system and standardizing the diagnosis and treatment of pelvic floor disorders.

Inclusion Criteria:

• Female, aged between 18 and 60 years old
• Signed the informed consent form
• Healthy group demonstrated no pelvic floor dysfunction
• SUI group had stress urinary incontinence symptom

Exclusion Criteria:

• Participants with cognitive behavioral disorders, mental illnesses, or those who are unable to cooperate
• Participants who cannot demonstrate correct pelvic floor muscle contraction
• Participants who were within 1 year postpartum
• Participants who were post hysterectomy
• Participants who had pain during internal exam or refused to have internal exam
• SUI group who had pelvic organ prolapse symptoms or whose POP-Q lowest level reached or exceeded the hymenal ring
• SUI group had urgency urinary incontinence symptoms
• SUI group had chronic constipation symptoms

Based on BMI values, it is planned to recruit 200 participants with BMI < 18.5 kg/m², 600 participants with BMI between 18.5 and 24 kg/m², and 200 participants with BMI > 24 kg/m². A total of 1,000 study subjects will be recruited for healhty group and 1,000 for SUI group, amounting to 2,000 participants in total.