Here is the design of a clinical trial:

Official Title: The Effect of Fertility Health Awareness Strategies on Fertility Knowledge and Childbearing in Young Married Couples (FertStart)

Included conditions:
- Fertility Awareness
- Childbearing Intentions

Study Armgroups:
- {'label': 'Fertility Health Screening', 'type': 'ACTIVE_COMPARATOR', 'description': 'Clinic-based fertility health screening and counselling', 'interventionNames': ['Diagnostic Test: Fertility Health Screening']}
- {'label': 'Fertility Awareness Tools', 'type': 'ACTIVE_COMPARATOR', 'description': 'Online intervention to provide fertility education and behavioural nudge for optimal reproductive timing.', 'interventionNames': ['Behavioral: Fertility Awareness Tools']}
- {'label': 'Control', 'type': 'NO_INTERVENTION', 'description': 'No intervention but exposed to usual information from the media on fertility and family benefits (no different from general population).'}

Interventions:
- {'type': 'DIAGNOSTIC_TEST', 'name': 'Fertility Health Screening', 'description': "Basic fertility health screening comprising an anti-Mullerian hormone (AMH) test and semen analysis, a doctor's consultation to explain the results, and standardised reproductive counselling by a trained nurse comprising a discussion of reproductive plans (including addressing barriers the couple face), education on age-related fertility decline and limitations of artificial reproductive technologies, advice on the optimal reproductive timing and when to seek further help. An educational brochure will be handed to the couple during the counselling session.", 'armGroupLabels': ['Fertility Health Screening']}
- {'type': 'BEHAVIORAL', 'name': 'Fertility Awareness Tools', 'description': 'Online intervention consisting of 1) video targeting fertility education and specific attitudes, social norms and perceived control for having children, 2) a fertility awareness tool (FERTISTAT) and 3) an educational brochure on fertility. This intervention can be self-administered and is therefore easily scalable.', 'armGroupLabels': ['Fertility Awareness Tools']}

Primary Outcomes:
- {'measure': 'Change in parenthood intentions', 'description': "The difference in the female partner's intended age at first birth at 6 months post-randomization compared to baseline, elicited by a direct question in pre and post-questionnaires.", 'timeFrame': 'Baseline (before intervention) and 6 months later'}

Please estimate the sample size based on the assumption: 
Significance level of 5% (two-sided), power of 80%, and a 30% dropout rate.
Sample size
        Comparative trials of fertility knowledge interventions demonstrated no or modest (â0.8 years) decreases in womensâ intended age at first birth.19â23 Based on a three-arm trial with several comparisons with the control, to detect a hypothesised difference of 0.5 years in the wifeâs intended age at first birth between the treatment arms at 6-month follow-up, with a hypothesised SD of 2âyears, at a significance level of 5% (two-sided) and a power of 80%, we need to randomise 216 couples in each of the two intervention arms and 305 couples in the control arm. To account for a 30% dropout rate, 310 couples in each intervention arms and 440 in the control arm (total 1060) are needed. We target to recruit 1200 couples, 352 in each intervention arm and 496 in the control arm, stratified by the wifeâs age group (25â29 and 30â34 years old). This represents about 2.6% and 1.7% of eligible females in the two age groups.49 The first 140 couples will be part of the pilot phase and may not be included in the final analysis if significant changes to the protocol are made thereafter.