Here is the design of a clinical trial:

Official Title: The Effect of Mobile Text Message on Behavioral Risks of Cancer Among College Students, Northeast Ethiopia: A Randomized Controlled Trial

Included conditions:
- Behavioral Risks of Cancer

Study Armgroups:
- {'label': 'Cancer specific Mobile text message', 'type': 'EXPERIMENTAL', 'description': 'This arm will receive daily mobile text message related with cancer risks and prevention', 'interventionNames': ['Behavioral: Cancer specific Mobile text message']}
- {'label': 'general health messages', 'type': 'ACTIVE_COMPARATOR', 'description': 'This arm will receive general health message once a week', 'interventionNames': ['Behavioral: General health messages']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'Cancer specific Mobile text message', 'description': 'The intervention is cancer specific lifestyle mobile text messages daily for 2 months', 'armGroupLabels': ['Cancer specific Mobile text message']}
- {'type': 'BEHAVIORAL', 'name': 'General health messages', 'description': 'Daily text related with general health message', 'armGroupLabels': ['general health messages']}

Primary Outcomes:
- {'measure': 'Physical activity level', 'description': 'For measuring physical activity International Physical Activity Questionnaires (IPAQ) will be used. The questions will ask the time study participants spent being physically active in the last 7 days. Then, it will be summarized as Metabolic Equivalents (METs).', 'timeFrame': 'on average 6 months'}
- {'measure': 'Health dietary score', 'description': 'Healthy diet score will be assessed the health diet score adapted from the WHO list of healthy diet foods, which is a Likert scale ranged from 1 to 6.', 'timeFrame': 'on average 6 months'}
- {'measure': 'Tobacco use', 'description': 'Tobacco smoking will be assessed using a series of questions adopted from the World Health Organization (WHO), which used to assess the duration, quantity and frequency of smoking within one month.', 'timeFrame': 'on average 6 months'}
- {'measure': 'Alcohol intake', 'description': 'Alcohol consumption will be assessed using a tool adopted from National Institute on Alcohol Abuse and Alcoholism (NIAAA), which used to assess participants consumption in the past 1 month.', 'timeFrame': 'on average 6 months'}
- {'measure': 'Risk perception', 'description': 'Risk perception will be measured using health belief model variables: perceived susceptibility towards cancer, perceived severity of cancer, perceived benefits of adopting behaviors, perceived barriers to adopting behaviors, perceived self-efficacy for adopting dietary behaviors and internal cues for adopting dietary behaviors, the items of this subscale will be measured on a Likert scale ranging from 1= "Strongly disagree" to 5 = "Strongly agree".', 'timeFrame': 'on average 6 months'}

Please estimate the sample size based on the assumption: 
95% confidence level, 80% power, 10% loss to follow up
Sample size and sampling strategy
        The sample size for the study was determined using the assumption of a design to demonstrate the superiority of a new intervention or text message compared to the control group in improving self-efficacy (superiority trial design), assuming a 2.9 mean difference of perceived self-efficacy to adopt healthy behavior between text message and control group, a 6.22 pooled standard deviation [22], 95% confidence level, 80% power, and an expectation of 10% loss to follow up. With a 1:1 ratio, the sample size was estimated to be 160 (80 intervention and 80 control group). The sample size will be allocated to Woizero Siheen Polytechnic College and Dessie College of teacherâs education based on proportional to the number of students. Studentsâ ID numbers will be obtained from the registrarâs office of each college and used as a sampling frame. Then; a simple random sampling method will be used to select study subjects.