[Retracted] Correlation Analysis of Inflammatory Markers CRP and IL-6 and Postoperative Delirium (POD) in Elderly Patients: A Meta-Analysis of Observational Studies

Table 2

Quality assessment based on Newcastle-Ottawa Scale (NOS).

Literature	Case selection (/4)	Comparability (/2)	Outcome indicators (/3)	Total (/9)
Xiang et al. [9]	4	2	3	9
Chen et al. [10]	4	2	2	8
Li et al. [14]	4	2	2	8
Brattinga et al. [15]	4	2	3	9
Lv et al. [16]	4	1	2	7
Cereghetti et al. [17]	4	1	2	7
Plaschke et al. [18]	4	1	2	7
Neerland et al. [19]	4	2	2	8
van Munster et al. [20]	4	2	3	9
Plas et al. [21]	4	2	2	8
Khan et al. [22]	4	1	2	7
Ren et al. [23]	3	2	1	6
Pol et al. [24]	3	2	2	7
Slor et al. [25]	3	2	3	7
Hasegawa et al. [26]	4	2	2	8
Pan et al. [27]	4	2	3	9