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Head size and intelligence.

We would like to raise some of the more obvious questions about the procedures and conclusions in the article by Lipper et al (Pediatrics 67:502, 1980) relating head circumference at birth to neurobehavioral outcome.
 One criterion stated for inclusion of an infant in the study was a birth weight less than the tenth percentile. How then can the authors proceed to divide their population into those who were below the tenth percentile (small for gestational age [SGA]) and those who were above the tenth percentile (appropriate for gestational age [AGA])?