CT.gov Country Primary-Only Gap

Paper

Which country-linked CT.gov portfolios most often leave older study pages without the primary outcome description while keeping the broader detailed-description field? 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-only gap as missing primary outcome description with detailed description still present, then ranked country-linked portfolios with at least 500 linked studies. The United States led the country-linked primary-only-gap stock table at 13,662 studies, followed by Canada at 2,381, France at 2,233, and Germany at 1,629. Iran had the highest large-country primary-only-gap rate at 18.4 percent, while India reached 15.1 percent and Canada 13.8 percent. Country-linked primary-only gaps show where the endpoint sentence disappears even though the broader study narrative remains visible in older registry records. Country-linked rows are non-exclusive because multinational studies can contribute to more than one national portfolio in registry link tables. They reflect registry link geography rather than jurisdiction.