. Author manuscript; available in PMC: 2012 Jan 1.

Published in final edited form as: Neurotoxicol Teratol. 2010 Jun 30;33(1):69–77. doi: 10.1016/j.ntt.2010.06.003

Table 1.

Variables considered for inclusion as covariates

7-Year Child Characteristics

Age at assessment^a (for growth, Progressive Figures, Pegboard, and CPT analyses only)

Gender^a (not used for CBCL and TRF analyses)

Number of illnesses

Number of injuries

Number of hospitalizations

Number of siblings^a

Stanford-Binet composite score^a (for TRF analyses only)

7-Year Maternal Demographic and Environmental Characteristics

Adult male in household^a

Age^a

Custody (maternal vs. non-maternal)

Depression^a [51]

Education^a

Family income

Height^a (for growth analyses only)

HOME^a [7]

Hostility^a [74]

IQ^a [14] (not used for growth analyses)

Marital status

Race^a

Social support^a

Work status^a

7-Year Maternal Substance Use

Alcohol^a

Cocaine^a

Marijuana^a

Other illicit drugs

Tobacco^a

Prenatal Substance Use (for each trimester)

Alcohol^a

Cocaine^a

Marijuana^a

Other illicit drugs

Tobacco^a

Variable was retained in final model