Dataset
Average clinical trial study length, by phase
owid.average-study-length-by-phase
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About
Median length of completed clinical trials by phase. The phase refers to the phase of drug development the drug is currently in (early phase 1, phase 1, phase 2, phase 3 or phase 4). The study length is the time from start date to completion date, given in days.
Cite as: ClinicalTrials.gov (2025) – with major processing by Our World in Data. “Average study length by phase” [dataset]. ClinicalTrials.gov, “Clinical Trials (ClinicalTrials.gov)” [original data].
- Publisher
- Our World in Data
- Tier
- Official
- Covers
- 1976–2025
- Places
- Countries, regions and groups of the world
- Updated
- annual
- Last modified
- 2025-07-28
- Units
- days
- License
- Creative Commons Attribution 4.0 International
- Method
- https://ourworldindata.org/grapher/average-study-length-by-phase
Columns
| Name | Type | Description |
|---|---|---|
| entity | text | country, region or group |
| code | text | ISO 3166-1 alpha-3, OWID_ for OWID's own groups, empty for most regions |
| year | integer | |
| avg_study_length_days | number | Average study length by phase (days) |
Dimensions
| Name | Values |
|---|---|
| entity | |
| year |