| | Disability category | 1982 | 1989 | 1994 | 1999 | 2004 | Overall change | Decline per year (%) |
| | Any | 26.5 | 24.8 | 23.2 | 21.2 | 19.0 | −28% | 1.27 | | Mild (IADL only) | 5.7 | 4.5 | 4.4 | 3.3 | 2.4 | −58% | 2.64 | | Moderate (1-2) | 6.8 | 6.6 | 6.1 | 6.3 | 5.6 | −18% | 0.82 | | Very severe (5-6) | 3.5 | 3.1 | 2.9 | 3.0 | 3.2 | −9% | 0.41 | | Institutionalized | 7.5 | 6.9 | 6.3 | 4.9 | 4.0 | −47% | 2.14 |
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