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Model-based longitudinal head circumference-for-age z-score by pre-natal cocaine exposure group (Adjusted for birth mother’s ethnicity, child’s gender the natural logarithm of pre-natal alcohol average daily volume; the natural logarithm of pre-natal average daily cigarettes; pre-natal marijuana use; Dubowitz gestational age (for observations taken at age 24 months or younger), and maternal pre-pregnancy height.). * p<.05 for slope within designated interval.
