Elise Burger1, Ruud Selles2, Shelly van Nieuwkasteele3, Gert Bessems4, Virginie Pollet5, Steven Hovius6, Christianne van Nieuwenhoven7. 1. Department of Plastic, Reconstructive and Hand Surgery, Erasmus MC, University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: e.burger@erasmusmc.nl. 2. Department of Plastic, Reconstructive and Hand Surgery, Erasmus MC, University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: r.selles@erasmusmc.nl. 3. Department of Plastic, Reconstructive and Hand Surgery, Erasmus MC, University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: s.nieuwkasteele@icloud.com. 4. Department of Orthopedic Surgery, Erasmus MC, University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: j.bessems@erasmusmc.nl. 5. Department of Orthopedic Surgery, Erasmus MC, University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: v.pollet@erasmusmc.nl. 6. Department of Plastic, Reconstructive and Hand Surgery, Erasmus MC, University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: s.e.r.hovius@erasmusmc.nl. 7. Department of Plastic, Reconstructive and Hand Surgery, Erasmus MC, University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: c.vannieuwenhoven@erasmusmc.nl.
Abstract
BACKGROUND: The purpose of this study is to develop a Dutch version of the Oxford Ankle and Foot Questionnaire for Children (OxAFQ-c) to allow evaluation of pediatric foot care. METHODS: The OxAFQ-c was translated into Dutch, according to the ISPOR-guidelines. Children with different foot and ankle complaints completed the OxAFQ-c at baseline, after two weeks, and after 4-6 months. Measurement properties were assessed in terms of reliability, responsiveness, and construct validity. RESULTS: Test-retest reliability showed moderate intraclass correlation coefficients. Bland-Altman plots showed wide limits of agreement. After 4-6 months, the group that experienced improvement also showed improved questionnaire outcomes, indicating responsiveness. Moderate correlation between the OxAFQ-c and the Kidscreen and foot-specific VAS-scores were observed, indicating moderate construct validity. CONCLUSIONS: The Dutch OxAFQ-c showed moderate to good measurement properties. However, because we observed limited sensitivity to changes and wide limits of agreement in individual patients, we think the questionnaire should only be used in groups.
BACKGROUND: The purpose of this study is to develop a Dutch version of the Oxford Ankle and Foot Questionnaire for Children (OxAFQ-c) to allow evaluation of pediatric foot care. METHODS: The OxAFQ-c was translated into Dutch, according to the ISPOR-guidelines. Children with different foot and ankle complaints completed the OxAFQ-c at baseline, after two weeks, and after 4-6 months. Measurement properties were assessed in terms of reliability, responsiveness, and construct validity. RESULTS: Test-retest reliability showed moderate intraclass correlation coefficients. Bland-Altman plots showed wide limits of agreement. After 4-6 months, the group that experienced improvement also showed improved questionnaire outcomes, indicating responsiveness. Moderate correlation between the OxAFQ-c and the Kidscreen and foot-specific VAS-scores were observed, indicating moderate construct validity. CONCLUSIONS: The Dutch OxAFQ-c showed moderate to good measurement properties. However, because we observed limited sensitivity to changes and wide limits of agreement in individual patients, we think the questionnaire should only be used in groups.