Table 7.

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

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**

Milestones: see overview tests in Table 1

PCBs, Calux-TEQ, DDE, HCB: see blood sampling and measurements

Sum PCB*HCB, sum PCB*DDE: see statistical analysis

* = 0.050 ≤ p < 0.10, ** = 0.010 ≤ p < 0.050, *** = 0.001 ≤ p < 0.010