Background: The oldest old (individuals over 90 years) are a fast-growing population. Characterizing their specificity would be helpful to adapt health care. This study aimed to characterize the cognitive, functional, nutritional, and physical status of individuals over 90.
Methods: We conducted a systematic review of cross-sectional or cohort studies of individuals aged 90 years old or more, living at home or in a nursing home, in April 2018. Two reviewers selected eligible articles, extracted data, and evaluated the risk of bias (assessed by the Newcastle-Ottawa Scale).
Results: The search strategy identified 3086 references; 35 articles were included referring to 8 cross-sectional and 27 longitudinal studies. Dementia was diagnosed in 30-42.9% of study participants, cognitive impairment in 12-50%, and 31-65% had no cognitive impairment. In terms of activities of daily living, 14-72.6% of individuals had no difficulty, 35.6-38% had difficulty, and 14.4-55.5% were dependent. For instrumental activities of daily living, 20-67.9% needed help. Regarding nutritional status, the Mini Nutritional Assessment Short Form mean score ranged from 10.3 (SD: 1.8) to 11.1 (SD: 2.4). Eight to 32% of individuals could not stand up from a chair, 19-47% could stand without the use of their arms; and 12.9-15% were not able to walk 4 m.
Conclusions: These results suggest a heterogeneous population with a certain proportion of oldest old with a low level of disability. These findings suggest that a specific approach in the care of the oldest old could help prevent disability.
Keywords: Aged 80 and over; Cognition; Nutritional status; Physical functional performance; Primary care; Systematic review.