Table 2.

Overview of instruments used

Utility		Loneliness		Social isolation
Measure	#	Measure	#	Measure	#
EQ-5D (-3L/-5L)	12 [32, 34, 37, 39–43, 45–47, 49]	UCLA LS 20 item	3 [32, 37, 46]	Lubben Social Network Scale-revised	1 [36]
AQoL-8D	3 [33, 35, 50]	Six-item De Jong Gierveld Loneliness Scale	1 [47]	The Lubben Social Network Scale- 6 item	2 [40, 41]
HUI2	1 [44]	De Jong Gierveld Loneliness Scale 11-item scale	4 [36, 39, 42, 43]	Friendship Scale	2 [34, 50]
HUI3	1 [36]	R-UCLA LS 3 item	2 [35, 41]	Social inclusion	1 [33]
15D	1 [48]	R-UCLA LS 20 item	1 [33]	Social health battery	1 [38]
EQ-5D + SF-6D	1 [38]	Single question	5 [35, 44, 45, 48, 49]