Table 1.

Jet airplane passengers

passenger number	passenger sex	passenger race	phosphorylated BChE	BChE activity, units/ml	number of flights in the trip	Flight duration, hours	destination
1a	female	White	positive	2.7	2	6	domestic USA
1b	female	White	negative	3.2	0	0	no airplane 6 months
2	male	White	positive	3.0	2	10.5	transcontinental
3a	female	White	positive	2.4	8	25	transcontinental
3b	female	White	negative	2.2	0	0	no airplane 3 months
4a	female	White	positive	2.2	2	5	domestic USA
4b	female	White	negative	2.3	0	0	no airplane 3 months
5	female	White	positive	3.4	4	10	domestic USA
6a	female	Asian	positive	2.2	2	12.5	transcontinental
6b	female	Asian	negative	3.3	0	0	no airplane 7 months
7a	female	Asian	negative	2.6	4	9	domestic USA
7b	female	Asian	negative	2.6	0	0	no airplane 15 months
8	female	White	negative	2.5	2	2.5	domestic USA
9a	male	White	negative	1.7	5	9	domestic USA
9b	male	White	negative	2.0	0	0	no airplane 4 months
10	male	White	negative	2.9	3	3	domestic USA
11	female	White	negative	2.7	8	17	transcontinental
12	female	White	negative	1.3	4	22.5	transcontinental

White passengers were non-Hispanic. Positive samples contain 0.05% to 3% phosphorylated butyrylcholinesterase (BChE). Negative samples contain less than 0.05% phosphorylated butyrylcholinesterase. Butyrylcholinesterase activity was tested in quadruplicate; the standard deviation for activity assays ranged from 1 to 5%. Four positive and two negative passengers were retested 3 to 15 months after their last jet airplane trip; results for the retested samples are in rows indicated by the letter “b”.