Here is the design of a clinical trial:

Official Title: Efficacy of Acupuncture for Intermittent Claudication of Patients With Lumbar Spinal Stenosis

Included conditions:
- Lumbar Spinal Stenosis
- Intermittent Claudication

Study Armgroups:
- {'label': 'Acupuncture', 'type': 'EXPERIMENTAL', 'description': 'The acupoints of Shenshu (BL23), "Dachangshu (BL25)", Weizhong (BL40), Chengshan (BL57) and Taixi (KI3) will be inserted.', 'interventionNames': ['Other: Acupuncture']}
- {'label': 'Sham acupuncture', 'type': 'SHAM_COMPARATOR', 'description': 'The acupoints of Shenshu (BL23), Dachangshu (BL25), Weizhong (BL40), Chengshan (BL57) and Taixi (KI3) will be inserted into a depth of 2-3mm.', 'interventionNames': ['Other: Sham acupuncture']}

Interventions:
- {'type': 'OTHER', 'name': 'Acupuncture', 'description': 'The acupoints of Shenshu (BL23), "Dachangshu (BL25)", Weizhong (BL40), Chengshan (BL57) and Taixi (KI3) will be inserted. For the bilateral" BL25", sterile disposable steel needles (Huatuo, Suzhou, China; 0.3 mm×75 mm) will be inserted to a depth of 50-70mm until until participates feel a sensation similar to electric shock radiating downward to the knees. For the other four acupoints (BL23, BL40, BL57 and KI3), the needles (Huatuo, Suzhou, China; 0.3 mm×40 mm) will be inserted to a depth of 15-25 mm, gently rotated three times and lifted to achieve de qi. It should be noted that the needle at KI3 will be inserted at an angle of 45°obliquely downward. There will be 18 treatment sessions with 3 times a week for continuous 6 weeks and a 30 min treatment per session.', 'armGroupLabels': ['Acupuncture']}
- {'type': 'OTHER', 'name': 'Sham acupuncture', 'description': 'The acupoints of Shenshu (BL23), Dachangshu (BL25), Weizhong (BL40), Chengshan (BL57) and Taixi (KI3) will be inserted into a depth of 2-3mm .No manipulation of needles without deqi will be conducted. The treatment duration and frequency of sessions for participants in the SA group will be the same as in the acupuncture group.', 'armGroupLabels': ['Sham acupuncture']}

Primary Outcomes:
- {'measure': 'The change in Modified Roland-Morris Disability Questionnaire (RMDQ) score from baseline', 'description': 'Modified Roland-Morris Disability Questionnaire (RMDQ) is a reliable pain-specific functional status questionnaire which is easy and simple for patients to complete. The RMDQ includes 24 questions with a score range of 0-24, and there is a phrase "caused by low back pain" after each question which could excluded other reasons for dysfunction of the back. For this scale, higher scores indicate more severe symptoms.', 'timeFrame': 'week 6'}

Please estimate the sample size based on the assumption: 
80% power, two-sided alpha level of 0.05, common standard deviation of 5.52, and a dropout rate of 20%.
Sample size
        With approximately 196 patients in the trial (98 in each group), the study is predicted to have 80% power to detect a between-group difference of 2.5 for the reduction in RMDQ score from baseline using a two-sided alpha level of 0.05 and assuming a common standard deviation of 5.52 and a dropout rate of 20%. A difference of 2.5 points on the RMDQ score was selected based on a 2â3-point change, which is the MCID recommended for sample size calculations for RMDQ scores [25].