Table 5.

NHL risk according to termite treatment and γ-chlordane levels in dust, by sex, age, site, race, education, farming status, family history of NHL, and histologic subtype

SubgroupTreated for termites before 1988*
γ-Chlordane above median detected value in dust
Ca/CoOR (95% CI)Ca/CoOR (95% CI)
Sex
    Men119/891.3 (0.9-1.8)104/601.5 (1.0-2.3)
    Women101/731.4 (0.9-2.0)80/621.0 (0.7-1.6)
Age (y)
    <4528/161.6 (0.7-3.3)20/101.4 (0.5-3.6)
    45-64109/871.0 (0.7-1.4)78/461.1 (0.7-1.8)
    ≥6583/591.8 (1.2-2.7)86/661.2 (0.8-1.9)
Study site
    Detroit9/61.1 (0.4-3.3)21/101.1 (0.5-2.7)
    Iowa56/291.6 (1.0-2.6)57/291.8 (1.1-3.1)
    Los Angeles126/971.3 (0.9-2.0)87/621.2 (0.7-2.2)
    Seattle29/300.8 (0.5-1.5)19/210.8 (0.4-1.5)
Race
    African American21/401.0 (0.5-2.2)13/180.5 (0.2-1.5)
    Caucasian177/1111.3 (1.0-1.8)158/981.3 (0.9-1.8)
    Other/UK22/111.4 (0.5-3.7)13/61.4 (0.4-5.6)
Education (y)
    <1221/171.0 (0.4-2.4)16/151.0 (0.4-2.6)
    12-15127/871.6 (1.1-2.2)111/731.2 (0.9-1.8)
    ≥1672/581.0 (0.7-1.6)57/341.4 (0.8-2.4)
Farming status
    Never farmed209/1541.3 (1.0-1.7)165/1111.2 (0.9-1.6)
    Ever farmed9/70.8 (0.3-2.6)18/111.9 (0.7-5.1)
Family history of NHL
    No181/1371.2 (0.9-1.6)150/1011.3 (0.9-1.8)
    Yes§9/24.3 (0.7-26.0)5/21.5 (0.2-10.6)
Histologic subtype
    Follicular41/1621.1 (0.7-1.6)42/1221.2 (0.8-1.8)
    Diffuse74/1621.5 (1.0-2.1)58/1221.4 (0.9-2.0)
    T cell13/1621.5 (0.7-3.0)12/1221.9 (0.8-4.2)
    Other78/1621.4 (1.0-1.9)61/1221.1 (0.8-1.7)
    Unknown14/1620.8 (0.4-1.7)11/1222.0 (0.5-7.4)
  • * n = 1,321 cases and 1,057 controls interviewed; reference = never treated for termites.

  • n = 682 cases and 513 controls with dust samples; reference = γ-chlordane not detected in dust.

  • Excludes two cases and one control with unknown farming status.

  • § Includes 11 cases and 6 controls reporting a family history of unspecified “lymphoma.”