Table 1.

NHL risk according to treatment for insects

No. usesNo. cases/controls*OR (95% CI)
All insects
    0-9169/1221.0
    10-99457/3920.8 (0.6-1.1)
    100-199290/2450.9 (0.6-1.2)
    200-299174/1221.1 (0.8-1.5)
    300-39991/790.9 (0.6-1.3)
    400-49950/410.9 (0.6-1.5)
    ≥50050/450.8 (0.5-1.4)
Lawn insects
    Never743/6121.0
    Ever343/2850.9 (0.8-1.2)
    1-9104/1110.7 (0.5-1.0)
    10-49122/861.1 (0.8-1.5)
    50-9958/451.0 (0.7-1.5)
    ≥10057/411.1 (0.7-1.7)
Garden insects
    Never566/4681.0
    Ever536/4601.0 (0.8-1.2)
    1-9149/1271.0 (0.7-1.3)
    10-49201/1601.0 (0.8-1.3)
    50-9973/730.8 (0.6-1.2)
    100-14957/530.9 (0.6-1.3)
    ≥15056/471.1 (0.7-1.7)
Indoor plant insects
    Never1,003/8181.0
    Ever143/1340.9 (0.7-1.2)
    1-967/610.9 (0.6-1.3)
    10-4936/390.8 (0.5-1.2)
    ≥5037/311.0 (0.6-1.7)
Crawling insects
    Never297/2201.0
    Ever973/8070.9 (0.7-1.1)
    1-9275/2310.8 (0.6-1.1)
    10-49331/2860.8 (0.6-1.1)
    50-99151/1190.9 (0.7-1.2)
    100-149100/890.8 (0.6-1.2)
    ≥150112/741.2 (0.8-1.8)
Flying insects
    Never530/4131.0
    Ever677/5750.9 (0.8-1.1)
    1-9214/1940.9 (0.7-1.1)
    10-49226/1711.0 (0.8-1.3)
    50-9999/751.0 (0.7-1.4)
    100-14973/561.0 (0.7-1.5)
    ≥15062/760.7 (0.5-1.0
Fleas/ticks on pets
    Never452/3781.0
    Ever777/6211.0 (0.8-1.2)
    1-9191/1780.8 (0.6-1.0)
    10-49284/1921.2 (0.9-1.5)
    50-99141/1131.0 (0.7-1.3)
    100-14994/850.9 (0.6-1.2)
    ≥15062/481.2 (0.8-1.8)
Fleas/ticks in home
    Never722/6411.0
    Ever430/3341.1 (0.9-1.3)
    1-9244/1811.1 (0.9-1.4)
    10-49115/961.0 (0.8-1.4)
    ≥5069/561.1 (0.8-1.6)
Termites
    Never806/6741.0
    Ever333/2541.3 (1.0-1.6)
    1116/881.3 (1.0-1.8)
    253/431.3 (0.8-2.0)
    3-430/221.3 (0.7-2.3)
    ≥538/251.5 (0.9-2.6)
  • * Cases and controls with a combination of “no” and “don't know” for different homes in response to the question “Was this home ever treated for [insect type]?” are excluded from the table. Cases and controls who treated for an insect type but provided no information on the treatment frequency for any of their homes are included in the “ever/never” risk estimates but excluded from analyses based on the number of uses.

  • Adjusted for site, sex, age, education, and race.