Table 1.

Using the rule of 9s to determine the alopecia severity score

Number of body parts (bp) affected	Percentage of body affected, %	Alopecia severity score
0 bp	0	0
Tail	1	1
1 bp	9	1
1 bp + tail	10	1
2 bp	18	1
2 bp + tail	19	1
3 bp	27	2
3 bp + tail	28	2
4 bp	36	2
4 bp + tail	37	2
5 bp	45	2
5 bp + tail	46	2
6 bp	54	3
6 bp + tail	55	3
7 bp	63	3
7 bp + tail	64	3
8 bp	72	3
8 bp + tail	73	3
9 bp	81	4
9 bp + tail	82	4
10 bp	90	4
10 bp + tail	91	4
11 bp	99	4
11 bp + tail (aka 12 bp)	100	4