“…Five studies had a specific focus on older age groups, 30,32,34,35,38 six included data from all age groups 29,31,33,37,39,40 and two included data from participants aged 18 years and above 36,41 . The majority of studies analysed data collected from the last decade 29–32,34–37,40 while the remainder used data collected between 1999 and 2004 33,38,39,41 . Ten studies had a specific focus on indigenous populations, 29–33,35–37,39,41 while three compared data from multiple population groups (including indigenous).…”