This study aims to explore how age and gender are associated with health deterioration related to caregiving among caregivers aged 75 and older in Spain.

Observational, descriptive, cross-sectional study.

Nationwide survey in Spain: 2020 Survey on Disability, Personal Autonomy and Situations of Dependency.

All non-professional caregivers identified by the survey (3746): 3166 caregivers younger than 75 (CG75–) and 580 caregivers 75 years old or older (CG75+).

Self-reported caregivers’ health deterioration, as a categorical variable (present or absent).

The majority of caregivers in both groups were women (63.2% of CG75– and 57.0% of CG75+, p=0.011). CG75+ provided care 16 hours/day (vs 14.1 hours/day of CG75–, p=0.032). Over half of CG75+ reported health deterioration (53.0%), compared with 43.5% of CG75– (p

In Spain, older caregivers have a specific socio-demographic profile, provide high-intensity care and report a higher caregiving-related health deterioration. However, the association between older age and health deterioration was found only in women. Public health interventions must prioritise older female caregivers.

Multimorbidity contributes significantly to poor population health outcomes while straining healthcare systems. Although some multimorbid patients experience an accelerated health decline (a decline in well-being or functional status that cannot be attributed to the natural ageing-related health deterioration), others can remain stable for years. Identifying risk factors for accelerated health decline in persons with multimorbidity could help prevent complications and reduce unnecessary interventions. Our review, therefore, aims to map the evidence on the clinical, biographical and healthcare-related factors associated with an accelerated health decline in multimorbid individuals.

We will use the evidence-mapping review methodology. We will perform a systematic comprehensive literature search in Medline via Pubmed, Cochrane Library, EMBASE, Web of Science and Google Scholar using two broad concepts: ‘multimorbidity’ and ‘longitudinal studies’. We will search with MeSH terms (eg, ‘Multimorbidity’ (Majr), ‘Longitudinal Studies’ (Majr)) and free text words (eg, multimorbidity, multiple chronic condition*, longitudinal), from inception to date of the final search. All original quantitative studies involving participants in primary care and related healthcare settings will be included. Abstract/titles and full-text screening and data extraction will be performed independently by two or more researchers to minimise selection and reporting bias, with conflicts resolved by consensus. The data will be analysed qualitatively, and topics will be extracted to create evidence clusters. Risk factors will be classified in groups and cross-referenced against the outcomes from respective studies into combinations of exposure-outcome clusters. The resulting evidence clusters will be described narratively and presented as bubble plots. The search, initiated in January 2023, will be updated following this protocol review to reflect the most current evidence; exact dates will be reported in the results manuscript.

Due to the nature of the proposed evidence map, ethics approval will not be required. Results from our research will be disseminated through publications in peer-reviewed journals and presentations at local, national and international conferences.

https://osf.io/q72xa/