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Table 3 Odds ratios (OR) for a male birth among offspring from parents in the Michigan Long-Term PBB Study with estimated serum PBB concentrations

From: A cohort study of the association between secondary sex ratio and parental exposure to polybrominated biphenyl (PBB) and polychlorinated biphenyl (PCB)

   N (%) Crude^ Unadjusted * Adjusted**
Exposure Variables (μg/L)   Offspring OR (95% CI) OR (95% CI) OR (95% CI)
Model 1 (Maternal estimated PBB only):     
   Maternal PBB   681    
   < 2   354 (52) 1.00 1.00 1.00
   ≥ 2   327 (48) 0.97 (0.72, 1.32) 0.97 (0.73, 1.29) 1.00 (0.75, 1.33)
Model 2 (Paternal estimated PBB only):     
   Paternal PBB   297    
   < 6   167 (56) 1.00 1.00 1.00
   ≥ 6   130 (44) 1.05 (0.67, 1.67) 0.90 (0.61, 1.32) 1.08 (0.71, 1.66)
Model 3 (Maternal and Paternal estimated PBB combined):   
Maternal PBB Paternal PBB 226    
< 2 < 6 83 (37) 1.00 1.00 1.00
other combinations 65 (29) 0.87 (0.45, 1.67) 0.89 (0.50, 1.59) 0.87 (0.52, 1.46)
≥ 2 ≥ 6 78 (34) 1.21 (0.65, 2.27) 1.13 (0.67, 1.90) 1.40 (0.84, 2.35)
  1. ^ Crude ORs are unadjusted for covariates or offspring born to the same mother or father
  2. * ORs are unadjusted for covariates, but adjusted for offspring born to the same mother or father
  3. ** 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