Associations between self-reported pest treatments and pesticide concentrations in carpet dust

Table 1 Pesticides concentrations in carpet dust (ng/g) in cases and controls in the Northern California childhood leukemia study, 2001–2007 (n = 583)

	N ^a	Detection Limit (DL) (ng/g)	% > DL	25th percentile	Median	75th percentile
Carbamate insecticides
Carbaryl	583	2	67	<DL	13.4	43.8
Propoxur	582	5	67	<DL	9.1	33.2
Organophosphate insecticides
Chlorpyrifos	583	5	89	11.9	27.5	73.1
Diazinon	583	2	80	3.1	9.7	31.0
Pyrethroid insecticides
Cyfluthrin	583	80	25	<DL	<DL	93.9
Cypermethrin	583	80	49	<DL	<DL	559
Permethrin	583	4	100	396	1062	4396
Synergist
Piperonyl butoxide	581	4	97	53.0	151	651
Herbicides
2,4-D	571	5	98	34.8	102	419
Chlorthal	583	1	35	<DL	<DL	1.6
Dicamba	572	5	28	<DL	<DL	2.8
Mecoprop	572	5	84	7.6	26.1	111
Simazine	583	2	90	11.3	19.3	32.9

^aNumbers <583 reflect samples missing due to interferences in chemical analysis or insufficient dust for the appropriate extraction method.

ISSN: 1476-069X