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The info that you're looking for is in the Opaque Surface Output Variables section of the EnergyPlus Input/Output Reference. Essentially, each variable corresponds to:

• Surface Inside Face Conduction Heat Transfer Rate: Conduction right at inside face of a surface. Positive values are for conduction towards the inside face.
• Surface Outside Face Conduction Heat Transfer Rate: Conduction right at outside face of a surface. Positive values are for conduction towards the outside face.
• Surface Average Face Conduction Heat Transfer Rate: Average conduction flowing through surface. Positive values are for conduction towards the inside face and zone (same sign convention as the inside face conduction variable).

I did a test of generating these three output variables for one surface, here are my results.

From this, it looks like the basic equation is $$ Average Conduction = \frac{Inside Conduction - Outside Conduction}{2} $$