decreased values in capillaries (hematocrit = 20% in the skeletal muscle capillaries), but in the spleen capillaries the value is 70-80%, because of the sequester function of the spleen;
The new-born children have a physiological polycythemia that is why their hematocrit is increased;
In the period of pregnancy, the hematocrit is decreased (there is a hemodilution because the plasma volume increases)
d) The people who live at height (6000-7000 m) have increased values of the hematocrit.