Data were obtained from the 2001 National Health Survey (NHS), which was conducted by the Australian Bureau of Statistics (ABS) using a stratified multistage area sample of private dwellings.26 Trained ABS interviewers performed face-to-face interviews with one selected resident from each dwelling. The response rate was 92% following sample loss, with a total of 26 863 respondents
This study is a Survey Research starting from sampling a population of 2,091 people.