Management of anticoagulation in patients with atrial fibrillation and renal dysfunction: A systematic review

Table 2 Quality assessment for observational studies (Newcastle-Ottawa Scale)

Ref.	Selection (4)	Comparability (2)	Outcome (3)	Total score (9)
Chan et al[14]	4	1	2	7
Winkelmayer et al[15]	4	2	3	9
Siontis et al[9]	4	2	3	9
Weitz et al[20]	4	2	3	9
Lai et al16]	4	2	3	9
Pisters et al[11]	4	2	3	9
Van Bulck et al[19]	4	2	3	9
Yao et al[7]	4	1	2	8
Matusik et al[6]	4	2	3	9
Liabeuf et al[18]	4	2	3	9
Akbar et al[17]	4	2	3	9