title: Test-retest reliability and agreement of the SPI-Questionnaire to detect symptoms of digital ischemia in elite volleyball players.
abstract: The Shoulder posterior circumflex humeral artery Pathology and digital Ischemia - questionnaire (SPI-Q) has been developed to enable periodic surveillance of elite volleyball players, who are at risk for digital ischemia. Prior to implementation, assessing reliability is mandatory. Therefore, the test-retest reliability and agreement of the SPI-Q were evaluated among the population at risk. A questionnaire survey was performed with a 2-week interval among 65 elite male volleyball players assessing symptoms of cold, pale and blue digits in the dominant hand during or after practice or competition using a 4-point Likert scale (never, sometimes, often and always). Kappa (κ) and percentage of agreement (POA) were calculated for individual symptoms, and to distinguish symptomatic and asymptomatic players. For the individual symptoms, κ ranged from "poor" (0.25) to "good" (0.63), and POA ranged from "moderate" (78%) to "good" (97%). To classify symptomatic players, the SPI-Q showed "good" reliability (κ = 0.83; 95%CI 0.69-0.97) and "good" agreement (POA = 92%). The current study has proven the SPI-Q to be reliable for detecting elite male indoor volleyball players with symptoms of digital ischemia.
authors.affiliation: a Department of Radiology , Academic Medical Center, University of Amsterdam , Amsterdam , The Netherlands.
authors.forename: Daan
authors.initials: D
authors.lastname: van de Pol
authors.affiliation: b Coronel Institute of Occupational Health, Academic Medical Center , University of Amsterdam , Amsterdam , the Netherlands.
authors.forename: Tigran
authors.initials: T
authors.lastname: Zacharian
authors.affiliation: a Department of Radiology , Academic Medical Center, University of Amsterdam , Amsterdam , The Netherlands.
authors.forename: Mario
authors.initials: M
authors.lastname: Maas
authors.affiliation: b Coronel Institute of Occupational Health, Academic Medical Center , University of Amsterdam , Amsterdam , the Netherlands.
authors.forename: P Paul F M
authors.initials: PP
authors.lastname: Kuijer
mesh_terms: D000328:Adult; D005385:Fingers / Q000098:blood supply*; D006801:Humans; D007511:Ischemia / Q000175:diagnosis*; D008297:Male; D011446:Prospective Studies; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D054798:Volleyball / Q000293:injuries*; D055815:Young Adult
keywords: Athletes; SPI-Q; agreement; periodic health surveillance; vascular pathology