Perhaps you should try some spelling variations:
significantly better » significantly greater (Expand Search), significantly higher (Expand Search), significantly lower (Expand Search)
significant linear » significant clinical (Expand Search), significant gender (Expand Search), significant level (Expand Search)
linear decrease » linear increase (Expand Search)
better decrease » greater decrease (Expand Search), teer decrease (Expand Search), between decreased (Expand Search)

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

• Removing quotes may allow a broader search: (( significant linear decrease ) OR ( significantly better decrease )).