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Table 2 Newcastle–Ottawa assessment scale quality assessment

From: Systematic review and meta-analysis of the sero-epidemiological association between Epstein-Barr virus and systemic lupus erythematosus

Study ID Selection Comparability Exposure
  S1 S2 S3 S4 C1 C2 E1a E1b E2 E3 E4
Berkun and colleagues [19] * * * * * *
Chen and colleagues [20] * * * * *
Chen and colleagues [21] * * * * *
Esen and colleagues [37] * * * * *
Evans [22] * * * ** n/a * *
Gergely and colleagues [23] * * * *
Huggins and colleagues [24] * * *
James and colleagues [13] * * * * *
James and colleagues [25] * * * * * *
Kitagawa and colleagues [26] * *
Lau and colleagues [27] * *
Lu and colleagues [28] * * * * *
Marchini and colleagues [29] *
Newkirk and colleagues [39] * * * *
Ngou and colleagues [30] * *
Parks and colleagues [18] * * * * * ** n/a * *
Stratta and colleagues [31] * * * * *
Stevens and colleagues [32] * ** n/a *
Sun and colleagues [15] * * * * *
Tazi and colleagues [33] * * * * * * * *
Tsai and colleagues [34] * * * * *
Us and colleagues [38] * * *
Westgeest and colleagues [40] * * *
Yokochi and colleagues [35] * * *
Zhang and colleagues [36] * * * * *
  1. S1, objective case definition used; S2, cases consecutively recruited or obviously representative; S3, community controls; S4, controls specified as having no history of disease; C1, controls matched for age; C2, controls matched for another factor; E1a, samples analysts blind to patient group (two stars); E1b, analysis conducted in clinical laboratory; E2, explicit laboratory cutoff value for positive result; E3, same method of ascertainment for cases and controls; E4, missing data reported. n/a, not available.