Table 3.
Representativeness of samples based on selected characteristics
| Online survey, external link | Online survey, internal page link | Postal survey 1 | Postal survey 2 | Census data | National Survey data | |
|---|---|---|---|---|---|---|
| Sample size | 1283 | 635 | 2976 | 618 | ~21.5 million | ~8880 |
| Young adult (18–24, %) | 32.9 | 10.3 | 7.0 | 7.3 | 9.8 | N/A |
| Older adult (≥ 60, %) | 16.4 | 12.6 | 16.5 | 20.3 | 19.6 | N/A |
| Gender (% female) | 57.5 | 83.3 | 60.8 | 62.2 | 50.3 | N/A |
| High school or greater education (%) | 85.4 | 77.2 | 93.31 | 79.1 | 74.22 | N/A |
| Speak language other than English at home (%) | 15.1 | 6.7 | 5.5§ | N/A | 19.3 | N/A |
| Major depression caseness (%) | 25.1 | 33.5 | 6.9 | 11.1 | N/A | 4.1 |
| Generalized anxiety disorder caseness (%) | 20.2 | 26.3 | 5.0 | 20.2 | N/A | 2.7 |
| Panic disorder caseness (%) | 13.6 | 22.2 | 1.4 | N/A | N/A | 2.6 |
Note: Postal survey 1 data from Christensen et al. (2011) using prototype measures projected to diagnostic criteria, with superscript 1 indicating data only available from 326 participants who participated in a second phase assessment; Postal survey 2 data from Griffiths et al. (2011) using Goldberg Depression and Anxiety Scales with cutoff of six; July 2012 census data from Australian Bureau of Statistics (2012b); National Survey Data from Australian Bureau of Statistics (2008); 2education data from Australian Bureau of Statistics (2012a). N/A, data not available.