Here is the design of a clinical trial:

Official Title: Project Grip&Health: A Behavioural Intervention Which Uses an Integral Approach to Reduce Stress, Smoking, Improve Financial Health and Self-perceived Health of Low SES-residents in Rotterdam

Included conditions:
- Smoking Cessation
- Smoking, Cigarette
- Smoking
- Stress
- Stress, Psychological
- Health Behavior
- Smoking, Tobacco

Study Armgroups:
- {'label': 'Stress management program (SM)', 'type': 'EXPERIMENTAL', 'description': 'The stress management program (SM) is a program which has been tailored to meet the specific needs of low-SES participants. The SM consists of 4-weekly sessions (1.5hours/session) and a follow-up session 8 weeks later. A core element of SM is its group-based format in which psycho-educative topics on stress responses and coping and motivation to stop smoking link up with cognitive and behavioural technique activities.', 'interventionNames': ['Behavioral: Stress management program (SM)']}
- {'label': 'Stress management + Buddy program (SM-B)', 'type': 'EXPERIMENTAL', 'description': 'The stress management + buddy program (SM-B) includes the same psycho-educative topics and exercises, cognitive and behavioural technique activities as the SM condition. The SM-B in addition to SM utilises one-to-one support through a buddy selected by a participant. A buddy, 18 year or older is a student or a volunteer who is recruited and trained by Indigo Rijnmond. The buddy pairs up with a participant and provides the following: supports participant in managing and filling in tax/welfare papers; 2) helps a participant to get a grip over his/her personal finances; and 3) helps a participant to overcome daily barriers (eg. arranging childcare). Over the duration of the course, the buddy meets up 6 times with a participant every second week in a public area.', 'interventionNames': ['Behavioral: Stress management + Buddy program (SM-B)']}
- {'label': 'Control', 'type': 'NO_INTERVENTION', 'description': 'Participants in the control condition are instructed to continue with their normal daily behaviour. They will be invited to complete the questionnaires and objective measurements at the equivalent times as the intervention groups, thus at baseline, 4 weeks after baseline and 12 weeks after baseline. After the control period, participants in the control condition will be offered the intervention.'}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'Stress management program (SM)', 'description': 'Participants follow the SM program.', 'armGroupLabels': ['Stress management program (SM)']}
- {'type': 'BEHAVIORAL', 'name': 'Stress management + Buddy program (SM-B)', 'description': 'In addition to receiving the SM, participants in the SM-B will also receive one-to-one support through a buddy.', 'armGroupLabels': ['Stress management + Buddy program (SM-B)']}

Primary Outcomes:
- {'measure': 'Self-reported Stress', 'description': 'Change in self-reported Stress.\n\nThe Depression, Anxiety and Stress (DASS) questionnaire will be used to measure change in self-reported stress from baseline (T0), at 4 weeks after baseline (T1) and at 12 weeks after baseline (T2).\n\nThe DASS is a 21-item questionnaire with three self-report scales (Depression, Anxiety and Stress). Scores for depression, anxiety and stress are determined by summing the scores of the 21 items. Ranges for depression, anxiety and stress are 0-28, 0-20, and 0-33, respectively. Lower scores indicate less severity.\n\nIn this study participants will be asked to complete the DASS-21 questionnaire at three different time points (T0, T1 and T2). This is done so the investigators can assess the change in scores of self-reported stress across time points (T0, T1 and T2).', 'timeFrame': 'at baseline (T0), 4 weeks after baseline (T1) and 12 weeks after baseline (T2)'}
- {'measure': 'Objective Stress', 'description': "Change in objective evaluations of stress based on heart rate variability (HRV) from baseline (T0), at 4 weeks after baseline (T1) and at 12 weeks after baseline (T2).\n\nHRV indicates variability of time intervals between two consecutive heartbeats with each heartbeat having a R-wave which peaks in the R peak. The variations between two RR intervals are defined as HRV. A higher HRV value reflects a greater variation of the RR whereas a lower HRV indicates small variation.\n\nParticipants beat-to-beat heart rate is measured using wrist wearables provided by Philips. During the measurements, the wearables are mounted on a participant's wrist and the participant is instructed to sit in a resting state for five minutes while the beat-to-beat heart rate is recorded. HRV analysis is derived from the recorded data using an appropriate software program. To assess change over time points (T0, T1 and T2), participants's beat-to-beat heart rate will be measured at three time points", 'timeFrame': 'at baseline (T0), 4 weeks after baseline (T1) and 12 weeks after baseline (T2)'}
- {'measure': 'Self-reported Smoking', 'description': 'Change in self-reported Smoking.\n\nThe Global Adult Tobacco Survey (GATS) questionnaire will be used to measure change in self-reported smoking from baseline (T0), at 4 weeks after baseline (T1) and at 12 weeks after baseline (T2).\n\nParticipants will be asked to complete the questionnaire at three time points (T0, T1 and T2). This is done so the investigators can assess the change in self-reported smoking across time points.', 'timeFrame': 'at baseline (T0), 4 weeks after baseline (T1) and 12 weeks after baseline (T2)'}
- {'measure': 'Dependence of nicotine', 'description': "Fagerstrom Test for Nicotine Dependence (FTND) questionnaire will be used to measure change in level of nicotine dependence from baseline (T0), at 4 weeks after baseline (T1) and at 12 weeks after baseline (T2).\n\nThe FTND test is used to assess the intensity of physical addiction to nicotine. The test is designed to provide an ordinal measure of nicotine dependence related to cigarette smoking. It contains six items that evaluates the quantity of cigarette consumption, the compulsion to use and dependence. Yes/No items on FTND are scores from 0-1 and multiple choice items are scores from 0-3. The items are summed to yield a total score of 0-10. The higher the FTND, the more intense a participant's physical dependence on nicotine.\n\nIn this study, participants will be asked to complete the FTND at three time points (T0, T1 and T2). This is done so the investigators can assess the change in the level of nicotine dependence across time points.", 'timeFrame': 'at baseline (T0), 4 weeks after baseline (T1) and 12 weeks after baseline (T2)'}
- {'measure': 'Carbon Monoxide breath test', 'description': "Change in exhaled Carbon Monoxide (CO) levels from baseline (T0), at 4 weeks after baseline (T1) and at 12 weeks after baseline (T2).\n\nThe CO breath test is a biological method used to verify smoking or non-smoking status of participants.\n\nIn this study, participants's exhaled CO levels will be measured (Micro SmokeLyzer; Bedfont, UK). A CO level ≥10 ppm reflects a heavy smoker. During the measurements, participants are instructed to hold their breath for 15 seconds and subsequently to slowly exhale into a mouthpiece connected to the SmokeLyzer device until their lungs are empty.\n\nParticipants CO levels will be recorded at three time points (T0, T1 and T2). This is done so the investigators can assess the change in C0 levels across time points.", 'timeFrame': 'at baseline (T0), 4 weeks after baseline (T1) and 12 weeks after baseline (T2)'}
- {'measure': 'Self-perceived health', 'description': 'The Short Form Health Survey version 2 (SF-12v2) questionnaire will be used to measure change in self-perceived health from baseline (T0), at 4 weeks after baseline (T1) and at 12 weeks after baseline (T2).\n\nThe SF-12v2 is a 12-item with three dimensions both for functioning (physical, social and role) and for wellbeing (mental health, general health perceptions and pain). In this study, participants will be asked to rate their general health on a Likert-type scale (1=poor, 2=fair, 3= good, 4= very good, and 5=excellent). Low scores (poor) on the general health scale represent a person who believes his/her health to be poor and high score (excellent) represents someone who sees his/her health as excellent.\n\nParticipants will be asked to complete the SF-12v2 questionnaire at three time points (T0, T1 and T2). This is done so the investigators can assess the change in health perceptions across time points.', 'timeFrame': 'at baseline (T0), 4 weeks after baseline (T1) and 12 weeks after baseline (T2)'}
- {'measure': 'Financial health', 'description': "Change in participant's's financial health will be measured from baseline (T0), at 4 weeks after baseline (T1) and at 12 weeks after baseline (T2).\n\nIn this study, participants's financial health will be measured by asking them to report: 1) their total monthly income; 2) their spouse/partner's total monthly income; and 3) money shortages experienced in the past month.\n\nParticipants will be asked to fill this questionnaire in at three time points (T0, T1 and T2). This is done to assess changes in financial health across time points.", 'timeFrame': 'at baseline (T0), 4 weeks after baseline (T1) and 12 weeks after baseline (T2)'}

Please estimate the sample size based on the assumption: 
Alpha error of 0.05, power of 0.80, and an expected attrition rate of 10%.
Sample size calculations
          Sample size calculations are based on the primary outcome measures (stress, smoking, and perceived health). To the best of our knowledge, no previous studies have evaluated a similar intervention in low-SES groups. Therefore, it is challenging to determine a prior the necessary sample size for multicomponent behavioral interventions. Previous studies that have evaluated similar components on other outcome measures recommend to aim for a sample size of 20-500 participants per intervention condition with an alpha error of 0.05 and a power of 0.80. to detect the expected effect. Assuming expected attrition of 10%, an initial sample of 300 participants are needed, thus 150 in each intervention condition. All power calculations are done using G*Power [76].