Table 6.

Associations between exposure and behaviour assessed through IBQ (beta coefficients)

IBQ	12 months
	N	scale 1 (stress)	scale 2 (smiling and laughter)	scale 3 (distress to limitations)	scale 4 (activity)	scale 5 (duration of orienting)
Sum PCB ng/g lipid	T = 96	−.081	−.164	.014	.047	−0.125
Girls	♀ = 44	NS	NS	NS	NS	NS
Boys	♂ = 52	NS	NS	NS	NS	NS
Calux-TEQ pg/g lipid	T = 68	−.247*	.117	.048	.119	.085
Girls	♀ = 37	NS	NS	NS	NS	0.468**
Boys	♂ = 31	NS	NS	NS	NS	NS
PCB-118 ng/g lipid	T = 95	−.092	.007	−.201*	−.131	−.061
Girls	♀ = 51	NS	NS	NS	NS	NS
Boys	♂ = 44	NS	NS	--0.379*	NS	NS
PCB-170 ng/g lipid	T = 95	.007	.187	−.103	−.054	−.083
Girls	♀ = 51	NS	NS	NS	NS	NS
Boys	♂ = 44	NS	NS	NS	NS	NS
HCB ng/g lipid	T = 93	−.150	.193*	−.022	.045	.182
Girls	♀ = 50	NS	NS	NS	NS	0.343*
Boys	♂ = 43	NS	0.386*	NS	NS	NS
DDE ng/g lipid	T = 100	−.201*	.071	−.147	.103	−.158
Girls	♀ = 54	−0.299*	NS	NS	NS	−0.308*
Boys	♂ = 46	NS	0.347*	NS	NS	NS
Sum PCB*HCB	T = 93	−.079	−.046	−.048	−.034	.031
Girls	♀ = 50	NS	NS	NS	NS	NS
Boys	♂ = 43	NS	NS	NS	NS	NS
Sum PCB*DDE	T = 96	.026	.078	.054	.159	.078
Girls	♀ = 52	NS	NS	NS	NS	NS
Boys	♂ = 44	NS	0.376*	NS	NS	NS

IBQ and IBQ scales: see overview tests in Table 1

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

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

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