Models that included the time variable "days per year" and stratification for age and province of residence were also assessed for the individual herbicide compounds bromoxynil, 2,4-DB, diallate, MCPA, triallate, and treflan. No significant associations were found. Individual compounds Days/yr NHL Controls ORa (95% CI) n % n % Herbicides  2,4-D Unexposed 406 78.5 1213 80.5 1 >0 and 2 55 10.6 160 10.6 1.17 (0.83–1.64) >2 and 5 36 7.0 82 5.4 1.39 (0.91–2.13) >5 and 7 9 1.7 20 1.3 1.38 (0.60–3.15) >7 11 2.1 31 2.1 1.22 (0.60–2.49)  Mecoprop Unexposed 464 89.8 1425 94.6 1 >0 and 2 31 6.0 48 3.2 2.27 (1.40–3.68) 2 22 4.3 33 2.2 2.06 (1.17–3.61)  Phosphonic acid: glyphosate Unexposed 466 90.1 1373 91.2 1 >0 and 2 28 5.4 97 6.4 1.00 (0.63–1.57) >2 23 4.5 36 2.4 2.12 (1.20–3.73)  Dicamba Unexposed 491 95.0 1456 96.7 1 1 26 5.0 50 3.3 1.58 (0.96–2.62) Insecticides  Malathion Unexposed 445 87.0 1379 91.6 1.00 >0 and 2 50 9.7 88 5.8 1.82 (1.25–2.68) 2 22 4.3 39 2.6 1.75 (1.02–3.03)  DDT Unexposed 485 93.8 1447 96.1 1.00 >0 and 2 18 3.5 32 2.1 1.75 (0.96–3.21) >2 14 2.7 27 1.8 1.50 (0.77–2.91) Fungicides  Captan Unexposed 497 96.1 1482 98.4 1.00 >0 and 2 11 2.1 12 0.8 2.69 (1.17–6.19) >2 9 1.7 12 0.8 2.80 (1.13–6.90)  Sulphur Unexposed 500 96.7 1485 98.6 1.00 Exposed 1 17 3.3 21 1.4 2.26 (1.16–4.40) Fumigant  Carbon tetrachloride Unexposed 504 97.5 1488 98.8 1.00 >0 and 2 13 2.5 18 1.2 2.13 (1.02–4.47)

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

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