Patients in this group will receive pelvic floor exercise program as described before and transcutaneous tibial nerve stimulation (TTNS).

The intervention will comprise 12 session of transcutaneous tibial nerve stimulation (Twice a week, for 6 continuous weeks). Each session will last 30 minutes. Two self adhesive surface electrodes will be positioned according to the protocol used by Booth et al and Sonmez et al, with the negative electrode 2 cm behind the medial malleolus, and positive electrode 10 cm proximal to it. Correct positioning will be determined by noting a hallux reaction (plantar flexion of great toe). Stimulation will be delivered at fixed frequency of 20 Hz and pulse width of 200 ms. The intensity level of the stimulation current (range 0-50 mA) will be determined once hallux reaction is observed, according to patient's tolerance.

Patients in this group will receive pelvic floor exercise program as described before and Sham stimulation.

The intervention will comprise 12 session of sham stimulation. (Twice a week, for 6 continuous weeks) Each session will last 30 minutes. Two self adhesive surface electrodes will be positioned According to the protocol used by Booth et al, with the negative electrode 2 cm behind the lateral malleolus, and positive electrode 10 cm proximal to it, therefore avoiding the posterior tibial nerve. The stimulation current will be reduced to 2 mA once the tingling sensation is obtained and patients will be informed that they may not feel electrical sensation during the session. Stimulation will be delivered at fixed frequency of 20 Hz and pulse width of 200 ms.

If willing, patients in this group will receive TTNS treatment after the study is completed.

Patients will be informed about pelvic floor muscles functions and written material will be given for home training.

Exercise program will be planned as 1 set, 3 times per day. Each set will include 10 pelvic floor contractions. Patient will be instructed to squeeze their pelvic muscles and keep them contracted for 8 seconds. Due to fatigue and spasticity patients may experience, patients will set their own resting periods between contractions. Patients will be told to avoid contracting abdominal and gluteal muscles and avoid holding their breathe during the exercise.

Patients will be instructed to perform exercise as following:

1. Lie on your back. Take a deep breathe. Relax your abdominal muscles as you breathe out.
2. Focus on your pelvic floor muscles. Squeeze your muscles as you are trying to stop the flow of your urine and stay contracted for 8 seconds, then relax.
3. Repeat when you feel ready. You need to repeat this 10 times.
4. Repeat this exercise 3 times per day

I-QOL is used for evaluation of quality of life in patients with incontinence. It comprises 22 questions presented under three subscales: limiting behavior, psychosocial impact, and social embarrassment. All the questions are based on a five-point Likert scale (1 = a lot, 2 = quite a bit, 3 = moderate, 4 = a little, and 5 = not at all). Points obtained by each question are added together which results in a total point of 0 to 110. This total point is then recalculated to take a value between 0-100 for better understand. Higher scores indicate a better quality of life. Validation of turkish version is available.

Post-void residue (PVR) will be calculated with ultrasonography. Evaluation will be made by same person in all patients after urination, in supine position transabdominally with 2-5 Mhz convex probe using E-Saote Mylab Seven (Italy) device.