Paper
Country-linked stock and rate diverge again here: the United States dominates on count, while Iran, France, and Norway are sharper on primary-outcome-gap rate.
Which country-linked CT.gov portfolios most often leave older study pages without primary outcome descriptions, obscuring the main endpoint for public readers? We analysed 249,507 eligible older closed interventional studies from the March 29, 2026 full-registry snapshot and exploded country links. We defined a primary-outcome gap as a missing primary outcome description, then ranked country-linked portfolios with at least 500 linked studies by stock and rate. The United States led the country-linked primary-outcome-gap stock table at 22,711 studies, followed by France at 4,653, Canada at 4,234, and Germany at 4,067. Iran had the sharpest large-country primary-outcome-gap rate at 28.5 percent, while France reached 27.7 percent and Norway 27.5 percent. Country-linked primary-outcome gaps show where registry pages most often omit the single line that defines the main endpoint of a study. Country-linked rows are non-exclusive because multinational studies can contribute to more than one national portfolio in registry link tables. They show registry link geography, not legal jurisdiction.