Currently there are 4 different scales with which to measure hair loss in women, created by different doctors (Ludwig scale, Olsen scale, Ebling-Roock scale, and Savin scale). Of these, the Savin scale is the most popular due to its details as a method to measure hair loss in women.
The first image (class 1) shows an image of a woman without hair loss. Images 2 - 4 (marked as classes 2, 3, and 4) indicate a progressive loss of hair along the midline of the scalp. Classes 5 and 6 show a diffuse and extensive hair loss but with a bit of hair surviving in these areas.
The image marked as complete represents a woman with extensive hair loss and little or no hair in the area affected by alopecia. Very few women reach this degree of baldness, and if they do so it is because they have some organic cause which justifies it, generally an excessive production of androgenetic hormones.