TABLE I.

Demographics of participants in the ALHS, 2009–2013

	Asthma analysis	Atopy analysis
	n (%)	n (%)
Characteristic	3229	3104
Sex
Male	1647 (51.0)	1589 (51.2)
Female	1582 (49.0)	1515 (48.8)
Enrollment status
Farmer	1698 (52.9)	1638 (52.8)
Spouse	1531 (47.4)	1466 (47.2)
State
Iowa	2269 (70.3)	2180 (70.2)
North Carolina	960 (29.7)	924 (29.8)
Race
White	3174 (98.3)	3052 (98.3)
Other	55 (1.7)	52 (1.7)
Asthma status
Case	1198 (37.1)	1155 (37.0)
Control	2031 (62.9)	1949 (63.0)
Smoking status
Never	2149 (66.6)	2061 (66.4)
Former	946 (29.3)	911 (29.4)
Current	134 (4.2)	132 (4.2)
Pack years, mean ± SD	6.0 ± 14.9	5.99 ± 15.0
Age (y), mean ± SD	62.7 ± 11.0	62.9 ± 11.1