'prevalence studies' is correct and can be used in written English.
For example: "The prevalence studies conducted by the university's scientists revealed surprising results."
Torrey, E. F. Prevalence studies in schizophrenia.
Several prevalence studies have been conducted across the globe.
Various approaches are used in genetic epidemiology, including population-based approaches, case-control studies, and prevalence studies.
Aarsland, D., Zaccai, J. & Brayne, C. A systematic review of prevalence studies of dementia in Parkinson's disease.
Epidemiologists say the wide variance in estimates from the prevalence studies that do exist support the idea that the disorder has not increased hugely.
Prevalence studies have been conducted in an attempt to estimate national figures for the number of people with dementia, and here the scale is important.
Prevalence studies are scarce, and there is a lack of valid instruments for measuring them.
Few FH prevalence studies have been performed in the Mexican adult population.
Currently, a systematic synthesis of PU incidence and prevalence studies in paediatric settings is missing.
Suggestions of research designs for future ASD prevalence studies are offered.
Because there is no single "hot spot" of high prevalence, studies have suggested that there is no single origin of HD in the UK.
