Figure 2.

Sinclair Scale (Collins et al 2006; Yip and Sinclair 2006).

Grade 1: is normal. This pattern is found in all girls prior to puberty but in only forty-five percent of women aged eighty or over.

Grade 2: shows a widening of the central part.

Grade 3: shows a widening of the central part and thinning of the hair on either side of the central part.

Grade 4: reveals the emergence of a diffuse hair loss over the top of the scalp.

Grade 5: indicates advanced hair loss.