Table I.

Patient demographics

Category	PN patients	Healthy controls
Age, years, mean ± SEM [range]	64 ± 1.9 [42–85]	63.1 ± 2.18 [44–78]
Sex (F/M)	23 [70%] / 10 [30%]	14 [70%] / 6 [30%]
Race
Caucasian	19 (58%)	13 (65%)
African American	8 (24%)	4 (20%)
Hispanic	3 (9%)	2 (10%)
Asian	3 (9%)	1 (5%)
Average itch intensity, mean ± SEM [range]	7.67 ± 0.4 [0–10]	N/A
Duration of itch, mean ± SEM [range], years	10.3 ± 1.5 [1–30]	N/A

F: female; M: male; SEM: standard error of the mean; PN: prurigo nodularis.