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Estimation of the prevalence of attention deficit/hyperactivity disorder among the standard population on the island of Majorca
AIM. To determine the rate of prevalence of attention-deficit/hyperactivity disorder (ADHD) in children of school age (6-11 years) in the Island of Mallorca.
SUBJECTS AND METHODS. The epidemiological study was conducted using a community sample extracted by means of multi-stage stratified sampling according to areas (rural, city and touristy) and schooling (public, private and concerted) and consisted in 1,509 children of both sexes. The ADHD Rating Scales-IV (ADHD RS-IV) for home and school setting were used to collect data. The optimal approach to do a diagnostic evaluation, according with the literature, was using a cut-off point of 90 centil.
RESULTS. The estimated prevalence of ADHD was 4.57% (confidence interval at 99%: 3.0-5.8%) and we also obtained 1.26% for the hyperactive subtype, 1.06% for the disattentional subtype, and 2.25% for the combined subtype. Contrary to what was expected, prevalence was higher for females but no statistically significant. There were no statistically significant differences between levels, schools or areas.
CONCLUSIONS. The estimates for prevalence found in this study are consistent with those reported in the literature (between 3-5%). Using the ADHD RS-IV which has different cut-off point regarding age, sex and setting and the fact that it was a poblational based study could explain the higher prevalence in the females. We propose a normalization of the scales in our area in other to confirm our findings.
Attention-deficit/hiperactivity disorder (ADHD)ChildhoodPrevalenceNeuropediatríaNeuropsiquiatría