1---2name: clinical3description: Clinical Research4---5# Clinical Research67## Overview8Clinical study design, statistical analysis, and regulatory compliance for medical research.910## Study Designs11| Design | Level of Evidence | Best For |12|--------|------------------|----------|13| RCT | I | Treatment efficacy |14| Cohort (prospective) | II | Risk factors, prognosis |15| Cohort (retrospective) | III | Exposure-outcome associations |16| Case-control | III | Rare diseases, risk factors |17| Cross-sectional | IV | Prevalence, correlations |18| Case report/series | V | Novel observations |1920## Common Analyses21- **Survival analysis**: Kaplan-Meier curves, Log-rank test, Cox regression22- **Diagnostic accuracy**: Sensitivity, specificity, ROC curve, AUC23- **Meta-analysis**: Fixed/random effects, forest plot, heterogeneity (I-squared)24- **Propensity score matching**: For observational study confounding25- **Nomogram**: Predictive model visualization for clinical use2627## Sample Size Calculation28- Define: alpha (usually 0.05), power (usually 0.80), effect size, outcome type29- Tools: G*Power, R `pwr` package, Python `statsmodels`30- Report: formula used, assumptions, expected dropout rate3132## Regulatory Compliance33- **IRB/Ethics committee**: Required for all human subjects research34- **Informed consent**: Written, voluntary, comprehensive35- **ClinicalTrials.gov**: Registration before enrollment (ICMJE requirement)36- **GDPR/HIPAA**: Data privacy for patient information37- **GCP (Good Clinical Practice)**: ICH E6 guidelines3839## Reporting Guidelines40| Guideline | Study Type |41|-----------|-----------|42| CONSORT | Randomized controlled trials |43| STROBE | Observational studies |44| PRISMA | Systematic reviews / meta-analyses |45| STARD | Diagnostic accuracy |46| TRIPOD | Prediction models |47| SPIRIT | Study protocols |
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