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. Author manuscript; available in PMC: 2011 Jun 21.
Published in final edited form as: Neurotoxicology. 2009 May 22;30(4):686–696. doi: 10.1016/j.neuro.2009.05.006

Table 4.

Correlation of covariates with each cognitive domain.

RPM
(n=268)		 VMIS
(n=269)		 NMIS
(n=269)		 DRIS
(n=269)		 CMIS
(n=269)		 BCAE
(n=236)		 LTR
(n=269)		 STM
(n=266)		 PSD
(n=268)		 APG
(n=263)		 VPG
(n=269)		 CKN
(n=250)		 FRG
(n=258)
r p r p r p r p r p r p r p r p r p r p r p r p r p
Adolescent
Sex (M/F) 0.11 0.08 0.18 <0.01 0.11 0.06 0.18 <0.01 0.17 0.01 0.17 0.01 0.05 0.37 0.04 0.52 0.40 <0.01 0.05 0.44 0.20 <0.01 −0.09 0.18 0.14 0.02
Age (years) 0.00 1.00 0.00 0.96 0.03 0.65 −0.07 0.25 0.01 0.90 0.13 0.05 −0.04 0.48 0.07 0.25 0.25 <0.01 −0.03 0.66 0.15 0.02 0.03 0.69 0.14 0.03
BMI (kg/m2) −0.05 0.41 0.09 0.13 0.05 0.43 0.06 0.30 0.08 0.18 −0.02 0.81 0.05 0.37 −0.01 0.90 0.07 0.25 −0.03 0.58 0.04 0.52 −0.02 0.74 0.00 0.95
Triglyceride level (mg/dL) −0.06 0.31 0.09 0.14 0.04 0.56 0.09 0.15 0.08 0.22 0.01 0.88 0.08 0.19 −0.01 0.84 0.05 0.43 0.04 0.52 −0.02 0.76 −0.05 0.40 −0.03 0.62
Cholesterol level (mg/dL) 0.06 0.33 0.08 0.19 0.03 0.61 0.03 0.66 0.06 0.30 0.09 0.16 0.09 0.13 0.08 0.22 0.04 0.49 0.03 0.63 −0.06 0.30 0.08 0.20 0.08 0.23
Maternal
Maternal BMI (kg/m2) −0.09 0.15 −0.05 0.45 −0.04 0.48 −0.01 0.88 −0.05 0.45 −0.19 <0.01 0.04 0.56 −0.18 <0.01 −0.03 0.63 −0.12 0.06 −0.05 0.44 −0.18 0.01 −0.09 0.14
Maternal Broad Cognitive Ability 0.25 <0.01 0.21 <0.01 0.24 <0.01 0.12 0.07 0.27 <0.01 0.29 <0.01 0.21 <0.01 0.28 <0.01 0.21 <0.01 0.20 <0.01 0.14 0.02 0.16 0.02 0.24 <0.01
Socioeconomic Status Index 0.06 0.32 0.10 0.12 0.17 0.01 0.12 0.05 0.16 0.01 0.15 0.03 0.03 0.63 0.15 0.01 0.10 0.10 0.11 0.07 0.11 0.07 0.07 0.24 0.13 0.04
Number of Social Problems Reported −0.13 0.03 −0.07 0.26 −0.17 0.01 −0.09 0.13 −0.15 0.02 −0.10 0.13 −0.05 0.40 −0.04 0.58 −0.12 0.05 −0.07 0.25 −0.02 0.73 −0.05 0.47 −0.10 0.11
Pregnancy Order −0.11 0.08 −0.10 0.09 −0.05 0.44 −0.09 0.14 −0.09 0.17 −0.16 0.01 −0.02 0.73 −0.06 0.31 −0.11 0.08 −0.10 0.10 −0.06 0.34 −0.13 0.04 −0.10 0.11
Cigarette Use during Pregnancy (#/day) −0.19 <0.01 −0.05 0.43 −0.12 0.04 −0.11 0.06 −0.10 0.10 −0.13 0.05 0.01 0.82 0.00 0.95 −0.09 0.14 −0.11 0.08 −0.15 0.01 −0.10 0.12 −0.12 0.05
Breastfeeding Duration (weeks) 0.05 0.39 0.07 0.26 0.07 0.26 0.06 0.31 0.07 0.22 0.08 0.23 −0.02 0.74 0.07 0.28 −0.04 0.53 0.05 0.43 0.13 0.03 0.12 0.07 0.10 0.10
Other Toxicants
HCB (ppb) 0.02 0.80 −0.07 0.25 −0.10 0.12 −0.11 0.08 −0.11 0.07 0.04 0.53 −0.09 0.13 0.06 0.30 −0.06 0.36 0.09 0.15 −0.01 0.81 0.08 0.21 0.04 0.53
p,p’-DDE (ppb) 0.05 0.42 0.01 0.89 0.04 0.50 −0.04 0.50 0.03 0.66 0.10 0.13 −0.03 0.64 0.11 0.08 −0.03 0.64 0.05 0.41 0.02 0.79 0.14 0.03 0.14 0.03
Mirex (ppb) −0.08 0.17 0.04 0.53 0.04 0.52 0.08 0.18 0.05 0.43 0.07 0.26 0.05 0.45 0.07 0.28 0.03 0.57 0.04 0.50 −0.05 0.39 0.08 0.21 0.02 0.74
Blood Lead (µg/dL) −0.04 0.53 −0.16 0.01 −0.09 0.13 −0.13 0.03 −0.14 0.02 −0.13 0.04 −0.03 0.58 −0.08 0.22 −0.13 0.03 0.05 0.47 −0.06 0.37 −0.05 0.43 −0.18 <0.01
Total Mercury (µg/dL) 0.00 0.94 −0.04 0.56 0.04 0.55 0.08 0.20 −0.01 0.93 −0.03 0.64 0.01 0.90 −0.02 0.79 −0.06 0.32 −0.09 0.17 0.01 0.84 −0.10 0.11 −0.08 0.22

Abbreviations: RPM = Ravens Progressive Matrices; VMIS = TOMAL Verbal Memory Index; NMIS = TOMAL Non-verbal Memory Index; DRIS = TOMAL Delayed Recall Index; CMIS = TOMAL Composite Memory Index; BCAE = WJ-R Broad Cognitiv Ability Extended; LTR = WJ-R Long Term Retrieval; STM = WJ-R Short Term Memory; PSD = WJ-R Processing Speed; APG = WJ-R Auditory Processing; VPG = WJ-R Visual Processing; CKN = WJ-R Comprehension-knowledge; FRG = WJ-R Fluid Reasoning.

Bold denotes p<0.2.