Perhaps you should try some spelling variations:
significantly longer » significantly lower (Expand Search), significantly larger (Expand Search), significantly higher (Expand Search)
longer decrease » larger decrease (Expand Search), linear decrease (Expand Search), largest decrease (Expand Search)
level decrease » levels decreased (Expand Search), level increased (Expand Search), level disease (Expand Search)
teer decrease » mean decrease (Expand Search), greater decrease (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: "(( significant ((level decrease) OR (teer decrease)) ) OR ( significantly longer decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( significant ((level decrease) OR (teer decrease)) ) OR ( significantly longer decrease ))*.