TABLE 6-2 Control Variables Assessed in the Faroe Islands and the Seychelles Studies

Covariates

Faroe Islands Study

Seychelles Study

Birth weight

 

X

Maternal cognitive competence (Ravens)

X

X

Child's age

X

--a

Child's sex

X

X

Gestational age

 

X

Smoking during pregnancy

X

X

Alcohol during pregnancy

X

X

Duration breast feeding

X

X

PCBs

X

--b

Education (mother and father)

X

 

Employment (family income)

X

X

Obstetric care

X

 

Daycare

X

X

Computer acquaintance

X

 

Examiner

X

 

Birth order

 

X

Maternal age

 

X

Child's medical history

 

X

Language at home

N/A

X

Maternal medical history

 

X

Maternal hair lead

Xc

Xd

aTest scores adjusted for age, based on U.S. norms.

bNo PCBs were detected in any of the 49 serum samples obtained at 66 months postpartum. These data support the assumption that there is virtually no PCB exposure in this population.

cWhole pregnancy.

dAt parturition, i.e., pregnancy minus 45 days.

were assessed in one study but not in the other (e.g., maternal age and birth order in the Seychelles study; obstetrical care in the Faroe study). However, the influences of those variables on cognitive outcome are



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