Matrix Metalloproteinases and Subclinical Atherosclerosis in Chronic Kidney Disease: A Systematic Review

Table 2

Quality assessment of the included studies (Newcastle-Ottawa scale).

Number	Author	Year	Newcastle-Ottawa scale scores
			Selection	Comparability	Exposure	Summary
1	Pawlak et al. [39]	2004	4	2	2	8
2	Addabbo et al. [37]	2007	4	2	2	8
3	Pawlak et al. [40]	2008	4	2	2	8
4	Nagano et al. [41]	2009	3	2	3	8
5	Coll et al. [9]	2010	4	2	2	8
6	Sánchez-Escuredo et al. [36]	2010	2	2	2	6
7	Belal et al. [42]	2014	3	1	2	6
8	Weber et al. [35]	2014	2	2	3	7
9	Isaac et al. [43]	2014	3	1	2	6

Selection criteria (): adequate case definition, representativeness of cases, selection of controls, and definition of controls. Comparability criteria (): control for factor A and an additional factor B on the basis of the design or analysis. Exposure criteria (): ascertainment of exposure, the same method for cases and controls, and nonresponse rate.