Perhaps you should try some spelling variations:
significantly impaired » significantly impairs (Expand Search), significantly improved (Expand Search), significantly improve (Expand Search)
significantly lower » significantly higher (Expand Search)
impaired decrease » marked decrease (Expand Search)
lower decrease » larger decrease (Expand Search), linear decrease (Expand Search), teer decrease (Expand Search)

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

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