Individual compounds+ NHL n = 517 Controls n = 1506 ORa (95% CI) ORadjb (95% CI) n exposed % exposed n exposed % exposed Malathionc 12 2.3 23 1.5 1.49 (0.72–3.11) 1.54 (0.74–3.22) Carbon tetrachlorided 13 2.5 18 1.2 2.13 (1.02–4.47) 2.42 (1.19–5.14)

^a ORs calculated with strata for the variables age and province of residence.

^b ORs adjusted for statistically significant medical variables (history of measles, mumps, cancer, allergy desensitization shots, and a positive family history of cancer in a first-degree relative) and with strata for the variables age and province of residence.

^c Malathion is an organophosphorus insecticide which has been used indoors as a fumigant.

^d Carbon tetrachloride was used as a grain fumigant.