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Table 2 QUADAS-2 data extraction score

From: The validity and reliability of the four square step test in different adult populations: a systematic review

Studies Domain 1
patient selection, bias/applicability
Domain 2
index test, bias/applicability
Domain 3
reference standard
bias/applicability
Domain 4
flow and timing bias
Dite and Temple [2] Low/low Low/low Low/low Low
Ibrahim, Altug and Cavlak [28] Unclear/low Low/low Low/low Low
Blennerhassett and Jayalath [23] Low/low Unclear/low Low/low High
Goh et al. [26] Low/low Unclear/low Unclear/low Unclear
Roos et al. [25] Low/low Low/low Low/low Low
Duncan and Earhart [20] Unclear/high Low/low Low/low Unclear
McKee and Hackney [24] Low/low Unclear/low Unclear/low Unclear
Quinn et al. [31] Low/low Unclear/low Unclear/low Low
Kloos et al. [29] Unclear/low Low/low Low/low Low
Wagner et al. [27] Unclear/low Unclear/low Low/low Low
Kalron and Givon [32] Unclear/low Unclear/low Unclear/low Low
Whitney et al. [21] Unclear/low Unclear/low Unclear/low Unclear
Choi et al. [33] Low/low Low/low Low/low Low
Dite et al. [30] Low/low Unclear/low Unclear/low Low
Schumacher et al. [22] Unclear/unclear Unclear/low Unclear/low Unclear