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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