Characteristics of the postcode-years in analytical sample (n = 13,752).

aIncludes Australia and New Zealand.bLow income is defined as average gross weekly income in the postcode–year less than AUD$200 per week in 2001–03 and less than AUD$250 per week in 2004–06; middle income is AUD$200–AUD$599 per week in 2001–03 and AUD$250–AUD$799 per week in 2004–06; high income is AUD$600 or more per week in 2001–03 and AUD$800 or more per week in 2004–06. The mean values shown refer to the percentage of all residents over 19 y whose income level falls into this classification.