title: Equivalence of online and clinician administration of a patellar tendinopathy risk factor and severity questionnaire.
abstract: The VISA-P is a questionnaire for assessing the severity of patellar tendinopathy (PT). Our study aim was to evaluate the equivalence of self-administration of the VISA-P online with the addition of risk factor questions to develop a tool suitable for high-volume remote use. A crossover study design with 107 subjects was used to determine equivalence between online and clinician administration. Three population groups were used to ensure construct validity. Online vs clinician administration revealed an intraclass correlation (ICC) of 0.79 [confidence interval (CI): 0.68-0.86] for the VISA-P with a systematic significant difference of 4.99, which is not clinically meaningful. Poor ICCs were seen for questions 7 and 8 of the VISA-P (0.37 and 0.47, respectively) in comparison with earlier questions. There were statistically significant differences between population groups for the VISA-P. The ICC for risk factor questions was excellent at 0.89 (CI: 0.84-0.93) with no mean difference (P = 1.00). The online questionnaire enables equivalent collection of VISA-P data and risk factor information and may well improve further with the suggested modifications to the instructions for questions 7 and 8. There is potential to use this questionnaire electronically to generate large databases in future research.
authors.affiliation: Centre for Sports and Exercise Medicine, William Harvey Research Institute, Mile End Hospital, Queen Mary University of London, London, UK.
authors.forename: S
authors.initials: S
authors.lastname: Morton
authors.affiliation: Centre for Sports and Exercise Medicine, William Harvey Research Institute, Mile End Hospital, Queen Mary University of London, London, UK.|BMI London Independent Hospital, London, UK.|Bart's Health NHS Trust, London, UK.
authors.forename: D
authors.initials: D
authors.lastname: Morrissey
authors.affiliation: FC Barcelona, Ciutat Esportiva Joan Gamper, Barcelona, UK.
authors.forename: X
authors.initials: X
authors.lastname: Valle
authors.affiliation: BMI London Independent Hospital, London, UK.
authors.forename: O
authors.initials: O
authors.lastname: Chan
authors.affiliation: Department of Public Health, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.
authors.forename: H
authors.initials: H
authors.lastname: Langberg
authors.affiliation: Centre for Sports and Exercise Medicine, William Harvey Research Institute, Mile End Hospital, Queen Mary University of London, London, UK.
authors.forename: P
authors.initials: P
authors.lastname: Malliaras
mesh_terms: D000293:Adolescent; D000328:Adult; D018592:Cross-Over Studies; D005260:Female; D006306:Health Surveys / Q000379:methods*; D006801:Humans; D020407:Internet; D008297:Male; D008875:Middle Aged; D017847:Patellar Ligament; D012307:Risk Factors; D057566:Self Report; D012720:Severity of Illness Index; D052256:Tendinopathy / Q000175:diagnosis*; D055815:Young Adult
keywords: Patellar tendinopathy; VISA-P; equivalence; online; risk factors