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Health Qual Life Outcomes. 2015 Nov 17;13:184. doi: 10.1186/s12955-015-0379-1.

Psychometric validation of the Weiss Functional Impairment Rating Scale-Parent Report Form in children and adolescents with attention-deficit/hyperactivity disorder.

Author information

1
Shire, 725 Chesterbrook Boulevard, Wayne, PA, 19087, USA. kl_gajria@hotmail.com.
2
QualityMetric Incorporated, 24 Albion Road, Building 400, Lincoln, RI, 02865, USA. mkosinski@qualitymetric.com.
3
Shire, 725 Chesterbrook Boulevard, Wayne, PA, 19087, USA. vanja.x.sikirica@gsk.com.
4
Klinik für Kinder- und Jugendpsychiatrie und -psychotherapie, Universitätsmedizin der Johannes Gutenberg-University Mainz, Langenbeckstr. 1, 55131, Mainz, Germany. michael.huss@unimedizin-mainz.de.
5
QualityMetric Incorporated, 24 Albion Road, Building 400, Lincoln, RI, 02865, USA. elayne_livote@uhc.com.
6
QualityMetric Incorporated, 24 Albion Road, Building 400, Lincoln, RI, 02865, USA. katpreilly@gmail.com.
7
Paediatric Psychopharmacology, Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, D-68072, Mannheim, Germany. ralf.dittmann@zi-mannheim.de.
8
Shire, 725 Chesterbrook Boulevard, Wayne, PA, 19087, USA. herder@shire.com.

Abstract

BACKGROUND:

Measurement properties of the Weiss Functional Impairment Rating Scale-Parent Report Form (WFIRS-P), which assesses attention-deficit/hyperactivity disorder (ADHD)-related functional impairment in children/adolescents (6-17 years), were examined.

METHODS:

Data from seven randomized, controlled trials were pooled. Analyses were conducted in two random half-samples. WFIRS-P conceptual framework was evaluated using confirmatory factor analyses (CFA). Reliability was estimated using internal consistency (Cronbach's alpha) and test-retest reliability methods. Convergent validity was assessed using correlations between WFIRS-P domain scores and the ADHD-RS-IV and Clinical Global Impression-Severity (CGI-S) scales. Responsiveness was tested by comparing mean changes in WFIRS-P domain scores between responders and non-responders based on clinical criteria.

RESULTS:

CFA adequately confirmed the item-to-scale relationships defined in the WFIRS-P conceptual framework. Cronbach's alpha coefficient exceeded 0.7 for all domains and test-retest reliability exceeded 0.7 for all but Risky Activities. With few exceptions, WFIRS-P domains correlated significantly (p < 0.05) with ADHD-RS-IV Total, Inattention and Hyperactivity-Impulsivity scores and CGI-S at baseline and follow-up in both random half-samples. Mean changes in WFIRS-P domain scores differed significantly between responder and non-responder groups in the expected direction (p < 0.001).

CONCLUSIONS:

Study results support the reliability, validity and responsiveness of the WFIRS-P. Findings were replicated between two random samples, further demonstrating the robustness of results.

PMID:
26577642
PMCID:
PMC4650258
DOI:
10.1186/s12955-015-0379-1
[Indexed for MEDLINE]
Free PMC Article

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