Table 2.

Population of interest categorised by the study focus

Patient population of interest	Study focus on processes of consent
	Innovating research methods (n = 37)	Applying research methods (n = 30)	Attitudes and ethical considerations (n = 22)	Total studies (n = 89)*
Palliative care/cancer	6 [43–48]	8 [49–56]	2 [57, 58]	16
Dementia	13 [59–71]	10 [40, 42, 72–79]	1 [80]	24
Geriatric care	2 [81, 82]	3 [83–85]	0	5
Parkinson’s disease	1 [86]	0	0	1
Cerebral ischaemic stroke	2 [87, 88]	0	1 [89]	3
Mental health	6 [90–95]	2 [96, 97]	1 [98]	9
Delirium	2 [99, 100]	2 [101, 102]	0	4
Intensive care	5 [103–107]	5 [108–112]	4 [113–116]	14
General population	0	0	13 [117–129]	13

*89 studies are reported from 91 publications (includes two study protocols [40, 42] reported with the main study papers [39, 41]