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01 November 2007

Is a line the same as a box? Speech assessment by VAS is not superior to Likert scales in laryngeal cancer patients

Mia Johansson, Caterina Finizia, Alessio Degl Innocenti, Anna Ryden

Med Sci Monit 2007; 13(11): CR481-487 :: ID: 512899

Abstract

Background: The primary purpose was to assess if VAS or Likert was relatively more suitable when assessing self-ratings of voice and speech in patients treated for laryngeal cancer. An additional purpose was to investigate whether the scales differed in measuring change after treatment.
Material/Methods: Using both VAS and Likert, 71 patients answered three questions at baseline and 12 months after treatment began. For test-retest analyses, additional data were used from 21 subjects. Non-parametric statistical methods suitable for comparing scales with different numbers of response alternatives were applied.
Results: Test-retest reliability was strongest for the Likert scale. From baseline to follow-up, both scales detected significant improvements. However, for some Likert scores the associated VAS values varied across a wide range, and this was true for assessments at baseline, at follow-up, and for score changes. At baseline the inter-scale concordance showed a greater number of disordered pairs than at follow-up and on both occasions the older group produced a greater number of disordered pairs.
Conclusions: No support for the superiority of VAS over Likert was found. However, VAS may produce instability in response patterns. When using self-ratings of voice and speech to identify a need of further rehabilitation, Likert scales seem better suited.

Keywords: Speech Intelligibility, Speech, Questionnaires, Pain Measurement, Laryngeal Neoplasms - therapy, Aged, 80 and over, Aged, 80 and over, Speech Intelligibility, Speech, Questionnaires, Pain Measurement, Laryngeal Neoplasms - therapy

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750