“…In most of the included studies, ADA of the CSF was measured using the methods of Giusti et al [19, 20, 31–38, 40–43, 45, 46, 48, 51–53, 55, 58, 60, 63], although other methods, such as spectrophotometric, commercial kit, modified Berthlot, colorimetry, Trinder enzyme‐coupled method, and the enzyme‐linked immunosorbent assay, and so forth were also applied. The ADSA cutoff was <10 U/L in 18 studies [15–17, 21, 22, 31, 32, 35, 36, 39, 43, 44, 51, 53, 54, 57, 60, 63], =10 U/L in 18 studies [18–20, 23, 24, 34, 38, 40, 45–49, 52, 55, 56, 58, 59], and >10 U/L in 7 studies [33, 37, 41, 42, 50, 61, 62]. Details of the quality evaluation of the included studies via the QUADAS‐2 criteria are shown in Table 2.…”