Table 4.

Risk of NHL according to termiticide applications and chlordane levels in dust

IsomerConcentrationNo termiticide applications
1-2 termiticide applications
≥3 termiticide applications
CasesControlsOR (95% CI)CasesControlsOR (95% CI)CasesControlsOR (95% CI)
γ-ChlordaneNot detected2622141.020151.3 (0.6-2.6)1291.1 (0.5-2.7)
≤ Median*92890.8 (0.6-1.2)21131.6 (0.7-3.3)771.1 (0.4-3.2)
> Median81481.5 (1.0-2.2)41341.3 (0.7-2.1)2692.8 (1.3-6.3)
α-ChlordaneNot detected3002491.027201.3 (0.7-2.4)14111.1 (0.5-2.5)
≤ Median67620.9 (0.6-1.3)22131.7 (0.8-3.5)771.1 (0.4-3.2)
> Median68401.5 (1.0-2.3)33291.2 (0.7-2.2)2473.5 (1.4-8.4)
  • NOTE: Table excludes 67 cases and 40 controls who had “no/unknown” termite treatment, and 53 cases and 35 controls who treated for termites but could not recall the number of times. Median concentrations of γ-chlordane and α-chlordane were based on all subjects, including those excluded from this table.

  • * Median detected γ-chlordane concentration among controls was 65.3 ng/g.

  • Median detected α-chlordane concentration among controls was 60.1 ng/g.