Table 1 Eligibility criteria

Inclusions

1. Women aged ≥ 18 years

2. Clinical diagnosis of OAB

3. Post-void residual < 100 ml

4. Able to complete questionnaires and interview

5. Willing to consent to participate

iExclusions

1. Cardiac pacemaker in situ

2. Leg ulcer/skin condition affecting lower legs

3. Diagnosed peripheral vascular disease

4. Absent sensation at the electrode site

5. Active UTI

6. Pregnancy

7. Previous PTNS/SNS

8. Previous intravesical botox treatment

9. Stress Urinary Incontinence as the predominant symptom

10. New treatment for OAB/incontinence commenced in the 4 weeks prior to TTNS