Perhaps you should try some spelling variations:
"c largest decrease" » "c largest decreases" (Expand Search), "c larger decrease" (Expand Search), "_ largest decrease" (Expand Search), "c 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)
"c marked decrease" » "c marked increase" (Expand Search), "_ marked decrease" (Expand Search), "a marked decrease" (Expand Search), "n marked decrease" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("c largest decrease") OR ("ct cases increased"))) OR ("c marked decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"c largest decrease\") OR (\"ct cases increased\"))) OR (\"c marked decrease\"))*".
• Removing quotes may allow a broader search: (((( c largest decrease ) OR ( ct cases increased ))) OR ( c marked decrease ))*.