Skip to main content

Advertisement

Table 9 Hypothesis testing summary

From: Concentrations of persistent organic pollutants in maternal and cord blood from the maternal-infant research on environmental chemicals (MIREC) cohort study

  Beta-HCH DDE Oxychlordane PBDE47 PCB118 PCB138 PCB153 PCB180 Transnonachlor PFHxS PFOA PFOS
Increasing parity - - - NS - - - NS* - - - -
Increasing maternal age NA + + NS* NA + + + NA - - NS*
Current smokers - - - NS* - - + - - NS* - NS*
High household income > $100,000 CDN + NS* + NS* + + + + + NS* + +
High pre-pregnancy BMI + - - + - - - - - NS* NS NS
Foreign born + + + - + + + + + - NS -
Fasting at time of sample NS - - NS NS - NS NS - NS NS NS
Lower maternal education - - - NS* - - - - - NS NS* -
Sampling year (2011 vs 2008) NA - - - - - - - - NS - -
Fish consumption + + + NS* + + + + + NS NS NS
Bacon consumption NA* - NS NA* NS* NS NS NS NS NS NS NS
Hamburger consumption - - NS* NS - - - - NS* NS NS NS
Pork consumption NS NS NS NS NS NS NS NS NS NS NS NS
Poultry consumption NS NS NS* NS NS* NS NS* NS* NS NS NS NS
Steak consumption NS NS NS NS NS NS NS NS NS NS NS NS
Cook with non-stick cooking vessels           NS + NS
  1. NA = not sufficient detection (>70 % below LOD) in categories for analysis
  2. NA* = significant interaction with chemical and lipids. See Additional file 1 for details
  3. NS = No statistically significant differences between groups
  4. NS* = overall a significant effect was seen for this characteristic (i.e. parity, maternal age, smoking status, income, BMI, education level) but the test could not identify with sufficient confidence which pairs of means differ. The Bonferroni-adjusted confidence intervals are a very conservative method
  5. - means a significant negative association (e.g. as parity increases DDE concentrations decrease)
  6. + means a significant positive association (e.g. as maternal age increases DDE concentrations increase)