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. 2023 May 22;11:272. Originally published 2022 Mar 3. [Version 3] doi: 10.12688/f1000research.109380.3

Table 1b. Top ten indicators from Truelove et al. (2020).

Human euthanasia programme
Health monitoring programme
Food enrichment
Physical enrichment
Social enrichment
Self-harm behaviour
Ventilation
Behavioural management programme
Hear other NHPs
Cage furniture