Table 1.

 Demographics of the study population.

Variable	All workers, n (%)	309th MXW, n (%)	388th FW, n (%)
Total workers	74 (100.0)	59 (100.0)	15 (100.0)
Gender
Male	66 (89.2)	51 (86.4)	15 (100.0)
Female	8 (10.8)	8 (13.6)	0 (0.0)
Ethnicity
White	64 (86.5)	52 (88.1)	12 (80.0)
Hispanic	7 (9.5)	6 (10.1)	1 (6.7)
African American	2 (2.7)	0 (0.0)	2 (13.3)
Other	1 (1.35)	1 (1.7)	0 (0.0)
Age (years)
Mean ± SD	37.7 ± 13.3	40.6 ± 13.1	26 ± 6.2
Range	20–65	24–65	20–40
Years worked at Hill AFB
Mean ± SD	8.1 ± 7.2	8.5 ± 7.6	6.5 ± 5.1
Range	0–35	0–35	0–20
Shift
Day	55 (74.3)	45 (76.3)	10 (66.7)
Swing	14 (18.9)	9 (15.3)	5 (33.3)
Night	5 (6.8)	5 (8.5)	0 (0.0)
Current smoker
Yes	20 (27.0)	18 (30.5)	2 (13.3)
Allergic history (n = 73)
Yes	30 (41.1)	26 (44.1)	4 (26.7)
Current asthma
Current	5 (6.8)	5 (8.5)	0 (0.0)