Acceptance of a New Voice Prosthesis | 209 8 Appendix A Additional information regarding used questionnaires 1) Study specific questionnaires: Acceptance of the PVHP, experiences and maintenance of current VP, comparison of VPs. Multiple-choice questions about the experiences using the regular and new VP (stickiness, voice quality and speech), maintenance of the VP and possible Adverse Events, Adverse Device Effects or Device Deficiency. The acceptance of the PVHP and preference for type of VP is asked at the end of the short-term study as well as after leakage or wearing the VP for twelve months. Part of this questionnaire is the Net promotor score26 (the probability that participants will recommend the new VP to others on a visual analog scale (VAS) from 0-10). There is a trade-off question regarding the minimal desired device lifetime to outweigh possible experienced adverse events, and there are comparative questions for experiences for speech/ voice, effort to speak, stickiness of the VP valve, leakage, cleaning of the VP. 2) Voice Handicap Index – 10 (VHI-10) The VHI-10 is a 10-item questionnaire to assess subjective voice quality. It contains ten statements and is used to assess subjective voice quality. Each statement has five answer options: never, almost never, sometimes, usually, and always. A score above 11 points is considered as having an abnormal voice, limiting daily life activities (range 0-40 points)15. The VHI-10 is often used, but not validated for laryngectomized patients19, 27 3) Visual Analogue Scale Voice (Vas Voice) With help of a VAS score, effort to speak is measured. In this score, 0 is the most effort to speak they could imagine, and 100 is the least effort to speak. A VAS is a measurement instrument that tries to measure a characteristic or attitude that is believed to range across a continuum of values and cannot easily be directly measured, most used for pain28. This VAS score gives a representation of the effort to speak.
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