Table 1.
Search strategy to locate literature in four online databases.
Fig 1.
A flow diagram of the search and paper selection process.
Table 2.
The ten included studies, ordered by year.
Table 3.
Summary of the samples of the ten included studies.
Table 4.
Methodological overview of the ten included studies.
Fig 2.
A summary of ten studies’ findings of creaky voice prevalence.
* See Table 4 # Exact value not reported. Abbreviations: ‘British MN’, modified northern accent; ‘British RP’, received pronunciation accent; ‘Conv’, conversation; ‘CP1’, conversation partner with substantial use of creaky voice; ‘CP2’, conversation partner with minimal use of creaky voice; ‘L1’, listener 1; ‘L2’ listener 2; ‘NR’, not reported; ‘P+C’, combined plain speech and clear speech.