Mapping prevalence and patterns of use of, and expenditure on, traditional, complementary and alternative medicine in New Zealand: a scoping review of qualitative and quantitative studies.

AIM: Traditional, complementary and alternative medicine (TCAM) is a popular healthcare choice worldwide. The extent of data available on TCAM, including prevalence and patterns of use in New Zealand, is unknown. This scoping review aims to map the existing research describing the use of TCAM (including prevalence, access, expenditure and concurrent use with conventional medicines) in New Zealand. METHOD: Research databases (MEDLINE, EMBASE, AMED, IPA (International Pharmaceutical Abstracts), CINAHL, PsycINFO and Scopus) and grey literature (Google Scholar and New Zealand government and relevant organisations' websites) were searched for studies published before 7 June 2019. Studies reporting on the prevalence and/or exploring aspects of TCAM use were included in this review. RESULTS: In total, 72 studies were reviewed. Available data suggest that TCAM use is widespread among New Zealanders, and some consumers pay large sums of money out-of-pocket. A wide range of TCAM practices and products is used by people of all ages and ethnicities and with various health conditions. There is some evidence of consumers using TCAM concurrently with conventional medicines. Studies were generally small, localised and conducted in sub-populations (e.g., specific age groups, health conditions). Different TCAM definitions, data collection tools, methods and prevalence measurement were used across studies, thereby limiting the comparability of data locally and internationally. CONCLUSION: A considerable number of studies/reports on TCAM use are available. Still, there is a lack of comprehensive, nationally representative data on prevalence and patterns of use of TCAM, including its use in relation to conventional medicine(s) in New Zealand.