Table 4

Odds ratios (OR) for a male birth among offspring from parents in the Michigan Long-Term PBB Study with enrollment serum PCB concentrations

N (%)

Crude^

Unadjusted *

Adjusted**

Exposure Variables (μg/L)

Offspring

OR (95% CI)

OR (95% CI)

OR (95% CI)

Model 1 (Maternal PCB only):

Maternal PCB

790

< 6

444 (56)

1.00

1.00

1.00

≥ 6

346 (44)

1.02 (0.77, 1.35)

0.99 (0.76, 1.30)

1.01 (0.77, 1.32)

Model 2 (Paternal PCB only):

Paternal PCB

253

< 8

141 (56)

1.00

1.00

1.00

≥ 8

112 (44)

1.06 (0.64, 1.75)

1.23 (0.83, 1.82)

1.24 (0.81, 1.88)

Model 3 (Maternal and Paternal PCB combined):

Maternal PCB

Paternal PCB

253

< 6

< 8

80 (32)

1.00

1.00

1.00

other combinations

116 (46)

1.26 (0.71, 2.22)

1.23 (0.77, 1.97)

1.00 (0.63, 1.57)

≥ 6

≥ 8

57 (22)

1.13 (0.57, 2.24)

1.39 (0.81, 2.40)

1.53 (0.93, 2.52)

^ Crude ORs are unadjusted for covariates or offspring born to the same mother or father

* ORs are unadjusted for covariates, but adjusted for offspring born to the same mother or father

** AORs are adjusted for covariates (Model 1 adjusted for year of offspring's birth; Models 2 and 3 adjusted for year of offspring's birth and paternal BMI as low and normal vs. high) and adjusted for offspring born to the same mother or father

Terrell et al. Environmental Health 2009 8:35   doi:10.1186/1476-069X-8-35