Study Classification

Retrospective study

Prospective study

Multicenter study

Observational study

Analytical observational study.

Anatomic study.

Case-control study.

Clinical case study-Case report.

Clinical trial.

Cohort study.

Correlational study

Cross-sectional study.

Descriptive study.

Expert opinion.

Experimental study.

Genome-wide association study.

Historical vignette

Intention-to-treat analysis.

Kaplan Meier analysis.

Letter to the editor or response

Meta-analysis.

Original research.

Perspective, opinion, and commentary.

Population-based study.

Prognostic study.

Proof of concept study

Qualitative study.

Review article.

Book review.

Systematic literature review,

Scientific Trial.

Technical note.

Univariate analysis.

In a primary study, the analysis is performed on only one measure, and in a secondary study the analysis is performed on several measures.

see Primary study.

Secondary study.

Proof of concept study

Single-center trial.

Multicenter trial.

Single-arm trial

Noninferiority trial

More terms and examples A randomized double-blinded clinical trial with a crossover research design.

ICONS study