| Variables | Mean (SD) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
1) | Gender | 0.50 (0.50) | - |
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2) | Hearing problems at age 54 | 0.10 (0.30) | −0.079*** | - |
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3) | Hearing impairment at age 7 | 0.11 (0.32) | −0.029 | 0.103*** | - |
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4) | Parental social class at birth | 3.35 (1.25) | −0.024 | −0.033* | −0.029 | - |
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5) | Childhood intelligence | 104.3 (12.69) | 0.067*** | −0.054*** | 0.021 | 0.268*** | - |
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6) | Educational qualifications | 2.71 (1.45) | −0.086*** | −0.020 | −0.011 | 0.341*** | 0.482*** | - |
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