Characteristics of different types of hypoxia

Hello,
My text book shows this diagram to explain characteristics of different types of hypoxia.

Arrows directed downward indicate a decrease and the arrows directed upwards indicate an elevation.

I know what each type is, but I don’t understand the above table. I can’t get an explanation of what happens to venous PO2 and venous O2 content in stagnant, anemic and histotoxic hypoxia.

Could someone give me explanation to the diagram?...

Characteristics of different types of hypoxia