In the flange analysis stress check per ASME sec VIII Div 1, CAESAR II output shows following stresses

1.Longitudinal Hub
2.Radial Flange
3.Tangential Flange
4. Max. Avg.
5. Bolting

Where as ASME sec VIII Div 1 shows stress calculation for above first three stresses only.
Please explain what is purpose and significance of calculating Max. Avg. stress and Bolting Stress?

Thanks