Box plots indicating number of articles in 4 clinical categories between 1990 and 1998. The squares indicate the average, while the horizontal lines indicate the 10^th, 25^th, 50^th, 75^th, and 90^th percentiles. The graphic displays indicate that the sensitive searches identify more articles than specific searches. The diagnosis, etiology, or prognosis categories had significantly more articles than therapy in sensitive search while etiology category had more articles than prognosis or therapy in specific search