Table 3

Mean serum levels of DDE and PCBs, stratified by various covariates

CovariateMean lipid-adjusted level of DDE (ng/g lipid)Mean lipid-adjusted level of PCBs (ng/g lipid)
naControlsCasesPbnaControlsCasesPb
Age <508910679890.5789749.8692.00.20
Age ≥5055157116200.8858893.9905.10.89
Yr between blood sample and diagnosis
<109011129350.2191772.0709.30.21
≥1054150617210.5056862.9884.60.77
ER concentrationc
<1040105410860.8439778.6693.90.23
≥10, <2014922.3758.40.3714778.5623.00.09
≥2029159211960.4031740.6791.70.51
PR concentrationc
<1024957.0899.60.7223805.7714.90.43
≥10, <10028105810710.9429784.1678.60.09
≥10019116310660.6420718.6782.60.48
  • a No. of case-control pairs in stratum.

  • b P calculated from paired t test.

  • c PMOL/g protein; P, pico.