Is it true that endometriosis is more common in some races?

Condition analysis: 

There seems to be some evidence among researchers that Caucasian women are at greater risk than blacks. Two studies have found the prevalence of endometriosis in blacks to be half that of whites. However, the notion that black women rarely suffer from endometriosis is incorrect. Some data shows that the risk of disease among Asian women is even higher than in Caucasians. There are also several studies which suggest that this disease is more common among higher socio-economic groups of women. 

Instructions: 

Sitz Bath: A contrast hot and cold sitz bath is often recommended by naturopathy practitioners for reducing symptoms of Endometriosis. The hot bath will help relax the pelvic muscles, in turn reducing cramping and pain. The cold bath will help reduce inflammation and alleviate pain.

-- Fill two large bathtubs, one with warm water and another with cold water.

-- Add 10 drops of rosemary essential oil or lavender essential oil to each bath and stir well.

-- Sit in the tub with hot water up to your waist for three to five minutes.

-- Then sit in the tub of cold water up to your waist for one minute.

-- Repeat for two to five rounds.

-- Do this three to four times a week.