Perhaps you should try some spelling variations:
significantly impaired » significantly improved (Expand Search), significantly improve (Expand Search), significantly improves (Expand Search)
significantly related » significantly correlated (Expand Search), significantly reduced (Expand Search), significantly greater (Expand Search)
impaired decrease » marked decrease (Expand Search)
related decrease » related disease (Expand Search), greater decrease (Expand Search), related diseases (Expand Search)

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

• Removing quotes may allow a broader search: (( significantly related decrease ) OR ( significantly impaired decrease ))~.