Table 1. Participant characteristics.

	AM operators year 1 (n = 5)	AM operators year 2 (n = 9)	Welders year 1 (n = 6)
Sex (Males/Females)	4/1	6/3	6/0
Age (median, min-max)	42 (28–55)	37 (23–48)	43 (20–50)
BMI (median, min-max)	30.6 (22.7–31.2)	28.2 (22.7–31.9)	28.1 (24.9–29.5)
Smokers (yes/no)	0/5	2/7	2/4
Self-reported asthma diagnosis (yes/no)	1/4	2/7	3/3
Self-reported allergy diagnosis (yes/no)	3/2	3/6	2/4
Years worked in current occupational setting (no. of participants)
<2	6	7	3
2–5	0	2	1
>5	0	0	2

AM: Additive manufacturing.