Normative values for singing voice handicap index - systematic review and meta-analysis

There are no official diagnostic protocols for singing voice assessment. In this publication, on the basis of a literature review, standards for the singing voice handicap index exclusively dedicated to voice disorders in singing have been given.

The study aims to determine the normative values for the singing voice handicap index.

The study is a systematic review and a meta-analysis. A systematic literature search was performed using PubMed to access relevant databases and to locate outcome studies. The "inclusion" criteria were as follows: English language, original papers and human studies retrospective and prospective papers, cross-sectional and case-control studies.

Eight articles were included for the final analysis. The normative value for the singing voice handicap index was 20.35 with a confidential range of 10.6-30.1 for a group of 729 healthy subjects whose voices were judged as normal, with an age range of 16-64 years.

The mean normative value of the singing voice handicap index was 20.35 with the confidence levels between 10.6 and 30.1.