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Cohort analytic study (Christchurch Health and Development Study).
Urban region of New Zealand.
A birth cohort of 969 children.
Assessment of risk factors
At 8 years of age maternal and teacher reports of the child's inattentive, restless, or hyperactive behaviours were obtained using an instrument that combined the Rutter and Conners parent and teacher questionnaires. A scale score was created and cut points divided the sample into 5 class intervals of inattentive behaviour (1–50, 51–75, 76–90, 91–95, and 96–100 centiles). Data on conduct problems and demographic, school, educational, and …
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