A total of 65 individuals donated nails (26 males; 39 females), while
only 45 of those completed the accompanying survey. Gender was recorded
regardless of survey completion. The average age of all participants
was 45 years old (n = 43) (mean male age was 51; mean
female age was 41). Only 4 minors (defined as participants under
18 years old), 2 males and 2 females, participated in the survey and
nail donation. All participants reported living in their current home for
at least one year, which negates concerns about capturing exposures
from other locations. On average the participants lived in their current
home for 20 years with residence times ranging from 1 to 74 years.