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versión impresa ISSN 0213-6163
Eur. J. Psychiat. v.23 n.2 Zaragoza abr.-jun. 2009
Maria Skounti PhD*, Katerina Mpitzaraki MD**, Anastas Philalithis MD***, Emmanouil Galanakis MD, PhD****
* 2nd Special Primary School, Heraklion, Crete
** Venizeleion General Hospital, Heraklion, Crete
*** Department of Social Medicine, University of Crete
**** Department of Pediatrics, University of Crete. Greece
Background and Objectives: Screening tests are of great diagnostic value in attention-deficit/hyperactivity disorder (ADHD), however final diagnosis relies on a clinical examination by an expert. The objective of the present study was to clinically evaluate children who had been screened positive for ADHD through both a parent and a teacher questionnaire.
Methods: Parent interview and child behavior checklist and clinical assessment were used to confirm the preliminary diagnosis in 42 children aged 8 years, who have been screened positive for ADHD out of 1,708 children, in a large, two-setting screening study conducted in Crete, Greece.
Results: The diagnosis of ADHD was confirmed for 31 children (74%). In the remaining 11 children, ADHD manifestations were attributed to other primary disorders. None of the 42 children was classified as lacking symptoms suggesting ADHD. Among the 31 children with confirmed ADHD, only 2 had been diagnosed prior to the screening test.
Conclusions: Although clinical evaluation is the golden standard for diagnosis of ADHD, two-setting screening questionnaires by parent and teacher are useful tools in identifying children who need further investigation and intervention.
Key words: Attention deficit hyperactivity disorder; Diagnosis; Psychiatric assessment; Screening tests.
Attention-deficit/hyperactivity disorder (ADHD) is among the most common, intensely investigated, and yet diagnostically controversial neurobehavioral conditions of childhood1. Recorded prevalence rates worldwide range from 2.4-17.8%, but the majority of epidemiological studies indicates prevalence rates ranging from 4% to 10%2,3. The core symptoms include inattention, hyperactivity and impulsivity. Three subtypes of ADHD listed in DSM-IV can be diagnosed: the predominantly inattentive type, the predominantly hyperactive-impulsive type and the combined type4. ADHD often associated with a variety of cognitive, psychiatric, educational, emotional and social impairments5,6. Some of these are a consequence of the disorder while other may arise from other primary disorders that overlap with ADHD7-9.
Several standardized behavior rating scales have been reported to perform well in screening of ADHD. These scales offer a convenience by providing a cross-sectional view of ADHD symptomatology, but definite diagnosis of ADHD is made exclusively on clinical grounds10-12. The aim of the present study was to investigate, by making use of a complete clinical assessment, children who had been found positive for ADHD by a large scale initial screening.
In a large-scale screening of ADHD among schoolchildren in Crete, Greece, all elementary school children attending the first grade of 55 primary schools were assessed, by using parent and teachers' rating scales. Briefly, among 1,708 children, 84 (6.5%; 95% confidence interval, 5.2% to 7.9%) screened positive by both parent and teacher for ADHD13.
Six months after the initial screening, all 84 children (58 boys, 26 girls) were called for clinical assessment. Of them, 42 (50%; 35 males, 7 females) were available. All children were Greek nationals except of two coming from immigrant families from Albania. Only two out of these 42 children had been previously diagnosed as having ADHD. Out of 42 parents who participated themselves in the clinical assessment, 12 (28.6%) had primary education degrees and come from lower socio-economic status, 20 (47.6%) had secondary school education degrees and 10 (23.8%) had higher education. Among the 42 families who were not available to clinical evaluation, four had moved to other residence, seven informed teachers that they were not eager to participate and the remaining 31 non-responders did not reply at all.
The initial screening procedure has been described elsewhere.13 Briefly, a 2-stage screening process was employed using Attention Deficit Hyperactivity Disorder test (ADHDT) by Gilliam14 and a rating scale of student behavior.15-16 Parents completed the ADHD test and teachers the rating scale of student behavior. ADHDT was based on DSM-IV diagnostic criteria; comprised of 36 questions in three subtests related to the three core symptoms of ADHD: hyperactivity, impulsivity and inattention. The test provided important information for the assessment of ADHD, including items investigating the disorder's age of onset, the existence of co-occurent disorders and the settings where ADHD symptomatology was present. Teacher's questionnaire was based on Lerner's behavior rating scale, enhance with items touching DSM-IV criteria for diagnosis of ADHD and was comprised of 50 items, evaluating auditory comprehension, verbal language, orientation, general behavior, motor behavior, attention, hyperactivity-impulsivity, optical-motor coordination, acoustic processing, memory and academic performance. All children who were screened positive by both parent and teacher questionnaire were called for clinical evaluation. The study was approved by both the Hellenic Ministry of Education and the Institutional Committee of the Faculty of Medicine, University of Crete.
Parents of screening-positive children were informed in written about the nature of the disorder and the potential benefits of their child having a clinical evaluation. Contact telephone numbers, the names and the affiliations of the investigating team, and the venue of the evaluation were also included. The clinic of a child-psychiatrist's was chosen as the place for the clinical evaluation, rather than a hospital milieu, where parents and children might feel less comfortable. Clinical evaluation was performed by a child psychiatrist (KM) and by a special educator specialized in children with developmental disorders (MS).
For a child to be definitely diagnosed as having ADHD, the criteria of the Diagnostic and Statistical Manual of Psychiatric Disorders (DSM-IV) 4 were applied. Children were assessed by semi-structured clinical parent interview17 (Table I). Clinical evaluation focused on presence of signs and symptoms; child's activities, school, friends, family relations, presence of symptoms suggesting other disorders, such as anxiety, depression, unusual thinking, hallucinations, coordination difficulties, gross and fine motor skills, reading, mathematics, speaking performance according to developmental level (examination performed by special educator), memory and comprehension; left-right recognition and optical-visual coordination. Throughout the interview, notes were kept of the child's behavior. At the end of the evaluation the child was allowed to play, draw or wander around the office.
Additionally all children were evaluated by Child Behavior Checklist (CBCL)18 a standardized parent-report questionnaire comprising of 113 items, for the assessment of multiple domains of children's psychopathology, including affective disorders, anxiety, ADHD, oppositional defiant disorder, somatic and conduct problems. In CBCL the parent indicates whether each item is very true (score of 2), somewhat true (score of 1), or not true (score of 0). A T-score of 69 or more is indicative for ADHD. The attention subscales, commonly used in the assessment of ADHD, have been shown to demonstrate adequate reliability and criterion-related validity18,19.
Differential diagnoses were classified after application of the exclusion criteria (according to criterion E of DSM-IV4 for ADHD diagnosis). Exclusion criteria included pervasive developmental disorders (e.g., autistic disorder, Asperger's syndrome), psychotic disorders, mood, anxiety and personality disorders, mental retardation, major neurological disorder (epilepsy, acute infantile hemiplegia, brain injury) and chronic medical conditions. The presence of any of these conditions was determined by the medical, developmental and family history obtained from the parent and by the clinical evaluation of each child.
Other conditions that might be mistaken for ADHD or might co-occur, apart from the disorders referred above12,20 were additionally considered before a definite diagnosis was made. Such co-concurrent conditions were identified by a detailed history, by the Child Behavior Checklist scored by parent, from the teacher questionnaire, which was available from the screening procedure and by the clinical evaluation.
Among the 42 children who were available for clinical evaluation, ADHD diagnosis was confirmed for 31 (73.8%), of whom 25 were boys and 6 were girls. In 22 (18 boys, 4 girls) the final diagnosis was ADHD combined type (ADHD-C), in 5 (all boys) ADHD predominately hyperactive-impulsive type (ADHD-HI) and in 4 (2 boys, 2 girls) ADHD predominately inattentive type (ADHD-I). The diagnosis of ADHD was re-confirmed in the 2 children who had been previously diagnosed as having the disorder.
For 11 children ADHD diagnosis was not confirmed as diagnostic criteria were fulfilled for other primary conditions. The distribution of the clinical diagnosis for all children is depicted in Table II.
Ratings scales constitute a convenient "first step" of assessment data indicating ADHD symptomatology and combined parent and teacher rating scales based on DSM-IV criteria may have a considerable predictive validity11,21. In the present study, out of 42 children who had been screened positive for the diagnosis of ADHD by parent and teachers rating scales, the diagnosis was confirmed for 31. For the remaining 11 children ADHD manifestations raised as a consequence of other primary disorders. Our study thus confirmed that positive screening results, even if not ultimately confirmed as ADHD, do suggest conditions leading to ADHD symptomatology.
The present study indicated that ADHD combined type is the most common form of ADHD, followed by ADHD-predominantly hyperactive - impulsive and inattentive subtype. These results come in accordance with other epidemiological studies indicating ADHD-combined type as the most prevalent among children 8-10 years old22.
In conclusion, our preliminary report supports the utility of ADHD screening test in school children. Positive questionnaires by both teachers and parents should be interpreted as suggesting ADHD or another primary disorder and as indicating children who need a full clinical evaluation. Our findings still confirm that clinical evaluation by a specialized physician remains the "gold standard" for the diagnosis of ADHD.
Due to lack of a widely accepted form for conducting clinical examination of the child, the majority of studies in ADHD literature don't use this practice in their diagnostic approach. Undoubtedly, future studies must focus on this important part of ADHD diagnosis.
A limitation of the present study is that the sample was very small, as several children initially screened positive were not available for the confirmatory clinical evaluation. Additionally, children screened negative were not called for clinical evaluation, hence sensitivity, specificity and negative predictive value of the screening procedure cannot be evaluated and no ROC curve is possible here; positive predictive value estimated at 73.8%, which is relatively good.
A further limitation of the study is that the person who conducted the clinical evaluation was not blind to the fact that children being evaluated had all been screened positive for ADHD.
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Dr Maria Skounti
2nd Special Primary School
713 05 Heraklion Crete. Greece
Tel: +30 6932 214222 & +30 2810 326828
Fax: +30 2810 223424 & 2810 394 606
Received: 14 July 2008
Revised: 17 January 2009
Accepted: 27 January 2009