| CI | Confidence Interval |
| ELSA | English Longitudinal Study of Ageing |
| OECD | Organisation for Economic Co-operation and Development |
| JAGES | Japan Gerontological Evaluation Study |
| NHS | National Health Service |
| RII | Relative Index of Inequality |
| UK | United Kingdom |
| SII | Slope Index of Inequality |
| WHO | World Health Organisation |
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