Circulating Irisin Levels in Patients with Nonalcoholic Fatty Liver Disease: A Systematic Review and Meta-Analysis

Table 2

Scores of the Newcastle-Ottawa Scale.

No.	First authors	Selection				Comparability	Exposure			Total
		①	②	③	④	⑤	⑥	⑦	⑧
1	Lou [17]	1	1	0	1	0	1	1	0	5
2	Xu [18]	1	1	0	1	0	2	1	0	6
3	Wu [15]	1	1	0	1	0	1	1	0	5
4	Choi [16]	1	1	0	1	0	1	1	0	5
5	Polyzos [19]	1	1	1	1	0	1	1	0	6

①: is the case definition adequate? ②: representativeness of the cases. ③: selection of controls. ④: definition of controls. ⑤: comparability of cases and controls on the basis of the design or analysis. ⑥: ascertainment of exposure. ⑦: the same method of ascertainment for cases and controls. ⑧: nonresponse rate.