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Table 7 Associations between exposure and motor development in terms of milestones (beta coefficients)

From: Neurobehavioural and cognitive effects of prenatal exposure to organochlorine compounds in three year old children

Milestonesss

Total Group

Grasping

T = 109

♀ = 56

♂ = 53

rolling over

T = 98

♀ = 50

♂ = 48

sitting up

T = 99

♀ = 50

♂ = 49

Crawling

T = 46

♀ = 28

♂ = 18

First steps alone

T = 46

♀ = 28

♂ = 18

Sum PCB ng/g lipid

−.178

.020

.212

.230

.338**

Girls

NS

NS

NS

NS

NS

Boys

−.371*

−.427*

NS

NS

NS

Calux-TEQ pg/g lipid

.043

−.015

.015

.145

.078

Girls

NS

NS

NS

NS

NS

Boys

NS

NS

NS

NS

NS

PCB-118 ng/g lipid

.013

−.090

−.064

−.016

.451***

Girls

NS

NS

NS

NS

NS

Boys

NS

NS

NS

NS

.577**

PCB-170 ng/g lipid

−.081

−.043

.049

.193

.366**

Girls

NS

NS

NS

NS

NS

Boys

NS

NS

NS

NS

.378*

HCB ng/g lipid

.049

.039

.049

.175

.330**

Girls

NS

NS

NS

NS

NS

Boys

NS

NS

NS

NS

.450*

DDE ng/g lipid

.082

.019

−.260***

.028

.119

Girls

NS

NS

NS

NS

NS

Boys

NS

NS

−.296*

NS

.642**

Sum PCB*HCB

−.065

−.101

−.032

.278**

.463***

Girls

NS

NS

NS

.327*

NS

Boys

NS

NS

NS

NS

.538**

Sum PCB*DDE

−.183

−.077

−.163

.279*

.343**

Girls

−.312*

NS

NS

NS

NS

Boys

NS

NS

NS

NS

.630**

  1. Milestones: see overview tests in Table 1
  2. PCBs, Calux-TEQ, DDE, HCB: see blood sampling and measurements
  3. Sum PCB*HCB, sum PCB*DDE: see statistical analysis
  4. * = 0.050 ≤ p < 0.10, ** = 0.010 ≤ p < 0.050, *** = 0.001 ≤ p < 0.010