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Table 6 Multiple stepwise regression analyses for determinants of PUFA levels in cord blood erythrocytes

From: Determinants of polyunsaturated fatty acid concentrations in erythrocytes of pregnant Japanese women from a birth cohort study: study protocol and baseline findings of an adjunct study of the Japan environment & Children’s study

  DHA (n = 1379) log-EPA (n = 1247) ARA (n = 1365)
Adjusted model R2 0.165 0.348 0.171
Variables B Standardized β p B Standardized β p B Standardized β p
PUFA level in maternal blood 0.31 0.34 <.0001 0.32 0.54 <.0001 0.39 0.31 <.0001
Household income
  < 2 (million Japanese Yen) -    reference   -   
 2 to <4 -    −0.022 −0.058 0.017 -   
 4 to <6 -    0.008 0.019 0.45 -   
 6 to <8 -    0.016 0.031 0.23 -   
  ≥ 8 -    −0.013 −0.022 0.40 -   
Smoking habits
 Never smoked -    reference   -   
 Ex-smokers before pregnancy -    0.006 0.020 0.56 -   
 Ex-smokers after pregnancy -    −0.014 −0.046 0.19 -   
Smokers -    −0.003 −0.007 0.86 -   
Body weight gain 0.016 0.064 0.011 -    -   
Fish intake -    0.036 0.065 0.0061 −0.26 −0.079 0.0016
Breakfast skipper (Yes) -    -    0.13 0.065 0.0088
Gestational age 0.020 0.18 <.0001 -    −0.024 −0.15 <.0001
Sex (male) 0.098 0.096 0.0001 -    −0.26 −0.18 <.0001
Season at birth
 Spring -    reference   -   
 Summer -    −0.032 −0.095 0.0008 -   
 Autumn -    0.073 0.22 <.0001 -   
 Winter -    −0.023 −0.068 0.017 -   
  1. Variables included in the model are indicated