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Sample characteristics; values are weighted mean (SD), except where specified as (%)
| Characteristics | All | Male | Female |
| Child | (n=1516) | (n=758) | (n=758) |
| Age, years | 11.9 (0.4) | 11.9 (0.4) | 11.9 (0.4) |
| Disadvantage index | 1026 (60) | 1026 (60) | 1025 (60) |
| Self-reported hearing impairment (%) | 1.3 | 1.2 | 1.5 |
| Parent | (n=1520) | (n=200) | (n=1320) |
| Age, years | 43.8 (5.1) | 45.9 (6.4) | 43.4 (4.8) |
| Self-reported hearing impairment (%) | 3.9 | 4.0 | 3.9 |
