Perhaps you should try some spelling variations:
significant mediating » significant variations (Expand Search), significant negative (Expand Search), significant variation (Expand Search)
mediating path » mediation path (Expand Search), mediating pathway (Expand Search), mediating vapb (Expand Search)
mean decrease » a decrease (Expand Search)
gap decrease » a decrease (Expand Search), gain decreased (Expand Search), step 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 ((gap decrease) OR (mean decrease)) ) OR ( significant mediating path ))~".
• Adding a wildcard symbol may retrieve word variants: (( significant ((gap decrease) OR (mean decrease)) ) OR ( significant mediating path ))*.