Table 4.

Characteristics of Control Probands and Comparison With Population Data, Australian Melanoma Family Study, 2001–2005

	Population Controls	Spouse Controls	Population Dataa
Highest level of education, %b
Junior secondary school	12.8**	7.0***	21.8
Senior secondary school	32.1	24.1**	31.2
Vocational	25.8	27.8	25.3
University	29.3**	41.2***	21.7
Born in Australia, by study center, %b
Brisbane	90.4***	96.1***	76.0
Sydney	80.9**	88.3***	63.6
Melbourne	93.4**	91.5***	70.6
Index of relative socioeconomic disadvantage, by study center, meanc
Brisbane	1,010.0	1,007.2	1,007.6
Sydney	1,040.0*	1,050.4**	1,016.8
Melbourne	1,039.3	1,030.5	1,020.6

Abbreviation: SEIFA, Socioeconomic Indexes for Areas.

* P < 0.05; **P < 0.01; ***P < 0.0001 (2-sided P values for comparison with population data, calculated by using a 1-sample test of proportion for categorical data and a 1-sample t test for continuous data).

^aPopulation data were obtained from the Australian Bureau of Statistics (www.abs.gov.au); country of birth was obtained from 2006 census data (ages 15–44 years), level of education from the 2002 Education and Work Survey (ages 20–44 years), and socioeconomic data from SEIFA (all ages).

^bAge-adjusted percentages using population data as the standard and excluding participants aged ≥45 years.

^cBased on 2001 SEIFA data published by the Australian Bureau of Statistics (www.abs.gov.au), unadjusted for age. The Index ranks areas on the level of social and economic well-being, and index scores have been standardized to have a mean of 1,000 and a standard deviation of 100 at the Collection District Level. A higher index value indicates less disadvantage. The mean SEIFA values for study participants were derived from the residential postcode at recruitment. For cases, the values were 1,005.1 (Brisbane), 1,047.1 (Sydney), and 1,034.6 (Melbourne).