Perhaps you should try some spelling variations:
"ct largest decrease" » "ct largest decreases" (Expand Search), "ct larger decrease" (Expand Search), "ct marked decrease" (Expand Search)
"_ largest decrease" » "_ largest decreases" (Expand Search), "_ larger decrease" (Expand Search), "_ marked decrease" (Expand Search), "_ large decrease" (Expand Search)
"ct cases increased" » "ct rate increased" (Expand Search), "ct levels increased" (Expand Search), "c2 cases increased" (Expand Search), "chd cases increased" (Expand Search), "ckd cases increased" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ct cases increased\") OR (((\"ct largest decrease\") OR (\"_ largest decrease\"))))~".
• Removing quotes may allow a broader search: (( ct cases increased ) OR ((( ct largest decrease ) OR ( _ largest decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("ct cases increased") OR ((("ct largest decrease") OR ("_ largest decrease"))))*.