The Pediatric Outcomes Data Collection Instrument for a Polish sample with juvenile idiopathic arthritis: psychometric properties of proxy version.
OBJECTIVE
The aims of the study were to investigate the psychometric properties of the Pediatric Outcomes Data Collection Instrument (PODCI) for parents of children aged 2-10 years, in a Polish sample of juvenile idiopathic arthritis and to compare the results from children with chronic arthritis to the results from a normative sample.


METHODS
The sample consisted of the parents of 29 (72.5%) girls and 11 (27.5%) boys. The ages of the children ranged from 2 to 10 years (mean 6.50, standard deviation [SD] 2.63). Disease course was classified as oligoarticular (n = 26, 65%) and polyarticular (n = 14, 35%). Parents who took part in the intrarater reliability study completed the Polish version of PODCI twice. The PODCI consists of the following subscales: Upper Extremity and Physical Function, Transfer and Mobility Tasks, Sports/Physical Functioning, Pain/Comfort, and Happiness. A Global Functioning Scale consists of the mean of the 'mean of items' values for the first four scales.


RESULTS
The mean standarized Global Functioning Scale was 81.79 (SD 13.45), whereas the mean normative Global Functioning Scale score equaled 33.65 (SD 18.19). Cronbach's alpha value of the Global Functioning Scale was excellent and equaled 0.81. The effect size concerning the Global Functioning Scale equaled 0.123. Test-retest reliability equaled 0.98, whereas intrarater reliability (intraclass correlation coefficient) equaled 0.99.


CONCLUSIONS
The translation and cross-cultural adaptation of the PODCI questionnaire provides a Polish equivalent to assess physical function in children with chronic arthritis.
Department of Pedagogy and Psychology, University of Security, Poznan, Poland.
Ewa
E
Misterska
Department of Pediatric Endocrinology and Rheumatology, Poznan University of Medical Sciences, Poznan, Poland.
Karolina
K
Adamczak
Department of Pediatric Endocrinology and Rheumatology, Poznan University of Medical Sciences, Poznan, Poland.
Dominika
D
Kaminiarczyk-Pyzałka
Department of Human Development Psychology and Family Studies, Adam Mickiewicz University, Poznan, Poland.
Katarzyna
K
Adamczyk
HCP Medical Centre, Poznan, Poland.
Jakub
J
Głowacki
Department of Pediatric Endocrinology and Rheumatology, Poznan University of Medical Sciences, Poznan, Poland.
Marek
M
Niedziela
Department of Pediatric Orthopedics and Traumatology, Poznan University of Medical Sciences, Poznan, Poland.
Maciej
M
Glowacki
D001171:Arthritis, Juvenile / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology; D002648:Child; D002675:Child, Preschool; D003466:Cultural Characteristics; D003625:Data Collection / Q000379:methods*; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D015588:Observer Variation; D011044:Poland; D011237:Predictive Value of Tests; D000074286:Preliminary Data; D011594:Psychometrics; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014175:Translating
PODCI-proxy version; construct validity; internal consistency; intrarater reliability; juvenile idiopathic arthritis