The psychological effect of birth weight leads to the most attention problems in children aged 9 to 10, according to a recent study. In previous studies, children with lower birth weights were seen with more symptoms of attention-deficit/hyperactivity disorder (ADHD). This study set out to model the continuous dose–response association between birth weight and psychological outcomes. Specificity was defined as one of the criteria for the study, to determine if the psychological effects caused by low birth weight are specific to attention problems. In many prior instances of association, other disorders were found in children, such as affective disorders, schizophrenia, substance-use disorders, and stress-related disorders. Because of this information, it is not certain that birth weight effects are specific to ADHD. 
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