Perhaps you should try some spelling variations:
"i values decrease" » "i values increased" (Expand Search), "i largest decrease" (Expand Search), "_ values decrease" (Expand Search)
"ai larger decrease" » "ai marked decrease" (Expand Search), "ai large decrease" (Expand Search), "a large decrease" (Expand Search), "_ larger 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: "((((\"i values decrease\") OR (\"ai larger decrease\"))) OR (\"ct cases increased\"))~".
• Removing quotes may allow a broader search: (((( i values decrease ) OR ( ai larger decrease ))) OR ( ct cases increased ))~.
• Adding a wildcard symbol may retrieve word variants: (((("i values decrease") OR ("ai larger decrease"))) OR ("ct cases increased"))*.