{"chart":{"slug":"clinical-trials-reporting-results","title":"How many finished clinical trials post their results?","takeaway":"21.5% of the clinical trials completed in 2024 had posted results on ClinicalTrials.gov by November 2026, down from 35.6% of those completed in 2008, when a U.S. law began requiring results for many trials. That law covers mainly U.S. trials of drugs and devices past Phase 1, so many trials, including most outside the U.S., don't have to post here; some publish results in journals instead. Results are due a year after a trial ends, so the chart stops two years back, and a year's share can still rise.","topic":"Clinical trials","chart_type":"line","ranking":false,"x_label":"Year the trial was completed","y_label":"% of completed trials with results posted","unit":"percent","points_count":17,"source":{"name":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2","url":"https://clinicaltrials.gov/data-api/api"},"license":{"name":"Public domain (U.S. government work); source National Library of Medicine","url":"https://www.nlm.nih.gov/web_policies.html#copyright"},"data_as_of":"2026-11-04","updated_at":"2026-11-04T17:20:36.703Z","url":"https://chart.ly/charts/clinical-trials-reporting-results","api_url":"https://chart.ly/api/v1/charts/clinical-trials-reporting-results","csv_url":"https://chart.ly/charts/clinical-trials-reporting-results/data.csv","image_url":"https://chart.ly/charts/clinical-trials-reporting-results/image.png","embed_url":"https://chart.ly/charts/clinical-trials-reporting-results/embed","credit":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2, via Chartly (https://chart.ly/charts/clinical-trials-reporting-results)","credit_html":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2, via \u003ca href=\"https://chart.ly/charts/clinical-trials-reporting-results\"\u003eChartly\u003c/a\u003e","average_label":null,"zero_axis":true,"data":[{"label":"2008","value":35.6},{"label":"2009","value":35.6},{"label":"2010","value":34.6},{"label":"2011","value":32.4},{"label":"2012","value":32.9},{"label":"2013","value":32.1},{"label":"2014","value":31.9},{"label":"2015","value":29.5},{"label":"2016","value":29.2},{"label":"2017","value":27.7},{"label":"2018","value":26.5},{"label":"2019","value":25.5},{"label":"2020","value":25.2},{"label":"2021","value":24.3},{"label":"2022","value":24.2},{"label":"2023","value":22.5},{"label":"2024","value":21.5}],"annotations":[]},"docs":"https://chart.ly/developers","terms":"Free to use with credit: wherever you show or quote a chart's data, name Chartly with a link to that chart's url (each chart's credit line does both) and credit its source as its license asks.","credit":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2, via Chartly (https://chart.ly/charts/clinical-trials-reporting-results)"}