1---2name: clinical3description: Clinical Research4---56# Clinical Research78## Overview9Clinical study design, statistical analysis, and regulatory compliance for medical research.1011## Study Designs12| Design | Level of Evidence | Best For |13|--------|------------------|----------|14| RCT | I | Treatment efficacy |15| Cohort (prospective) | II | Risk factors, prognosis |16| Cohort (retrospective) | III | Exposure-outcome associations |17| Case-control | III | Rare diseases, risk factors |18| Cross-sectional | IV | Prevalence, correlations |19| Case report/series | V | Novel observations |2021## Common Analyses22- **Survival analysis**: Kaplan-Meier curves, Log-rank test, Cox regression23- **Diagnostic accuracy**: Sensitivity, specificity, ROC curve, AUC24- **Meta-analysis**: Fixed/random effects, forest plot, heterogeneity (I-squared)25- **Propensity score matching**: For observational study confounding26- **Nomogram**: Predictive model visualization for clinical use2728## Sample Size Calculation29- Define: alpha (usually 0.05), power (usually 0.80), effect size, outcome type30- Tools: G*Power, R `pwr` package, Python `statsmodels`31- Report: formula used, assumptions, expected dropout rate3233## Regulatory Compliance34- **IRB/Ethics committee**: Required for all human subjects research35- **Informed consent**: Written, voluntary, comprehensive36- **ClinicalTrials.gov**: Registration before enrollment (ICMJE requirement)37- **GDPR/HIPAA**: Data privacy for patient information38- **GCP (Good Clinical Practice)**: ICH E6 guidelines3940## Reporting Guidelines41| Guideline | Study Type |42|-----------|-----------|43| CONSORT | Randomized controlled trials |44| STROBE | Observational studies |45| PRISMA | Systematic reviews / meta-analyses |46| STARD | Diagnostic accuracy |47| TRIPOD | Prediction models |48| SPIRIT | Study protocols |
gabrielmoreira