Preoperative butyrylcholinesterase activity and risk of postoperative delirium: A meta-analysis

Table 2 Study quality evaluation via the Newcastle-Ottawa Scale

Ref.	Representativeness of the exposed cohort	Selection of the non-exposed cohort	Ascertainment of exposure	Outcome not present at baseline	Control for age and sex	Control for other confounding factors	Assessment of outcome	Enough long follow-up duration	Adequacy of follow-up of cohorts	Total1
Zajonz et al[16], 2023	1	1	1	1	1	1	1	1	1	9
Gruendel et al[17], 2024	1	1	1	1	1	1	1	0	1	8
Schlake et al[18], 2024	1	1	1	1	1	1	1	0	1	8
Cerejeira et al[25], 2011	1	1	1	1	1	1	1	0	1	8
Müller et al[26], 2019	1	1	1	1	1	1	1	0	1	8
Adam et al[27], 2020	1	1	1	1	1	1	1	0	1	8
Lin et al[28], 2020	1	1	1	1	1	1	1	1	1	9
Chen et al[29], 2021	0	1	1	1	1	1	1	0	1	7
Guenther et al[30], 2021	1	1	1	1	1	1	1	0	1	8
Saha et al[31], 2021	1	1	1	1	1	1	1	1	1	9
Takano et al[32], 2021	1	1	1	1	0	0	1	1	1	7
Bosancic et al[33], 2022	1	1	1	1	1	1	1	1	1	9
Chen et al[34], 2023	1	1	1	1	0	0	1	1	1	7

¹Each item scored as 1 if the criterion was fulfilled and 0 if not; total score represents the sum across domains (maximum = 9).