Systematic review: preoperative psychological factors and total hip arthroplasty outcomes

Table 1 Risk of bias assessment for observational studies

	Was the outcome absent at the start of the study?	Are all members of the cohort equally capable of developing the outcome?	Was the outcome measurement performed in the same manner with similar intensity in the groups being compared?	Were the groups similar at baseline?	Did the authors perform analyses adjusting for known confounders?	Were all the withdrawals and dropsout described and accounted for?	Did the authors describe other possible sources of bias or confounders?
Badura-Brzoza [4]	Yes	Yes	Yes	Yes	No	No	No
Benditz [5]	Yes	Yes	Yes	?	No	Yes	Yes
Brembo [6]	Yes	Yes	Yes	?	Yes	Yes	Yes
Duivenvoorden [7]	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Etcheson [8]	Yes	Yes	Yes	Yes	Yes	No	Yes
Galea [9]	Yes	Yes	Yes	No	Yes	Yes	Yes
Hassett [10]	Yes	Yes	Yes	Yes	Yes	No	Yes
Hossain [11]	Yes	Yes	Yes	No	Yes	No	Yes
Jaiswal [12]	Yes	Yes	Yes	No	Yes	Yes	No
Lindner [13]	Yes	Yes	Yes	?	No	Yes	Yes
Mercurio [14]	Yes	Yes	Yes	?	No	Yes	Yes
Negrini [15]	Yes	Yes	No	?	No	No	Yes
Pinto [16]	Yes	Yes	Yes	Yes	No	No	Yes
Quintana [17]	Yes	Yes	Yes	No	Yes	Yes	Yes
Rasouli [18]	Yes	Yes	Yes	Yes	Yes	No	Yes
Riediger [19]	Yes	Yes	Yes	No	No	Yes	No
Rolfson [20]	Yes	Yes	Yes	Yes	Yes	No	No
Salmon [21]	Yes	Yes	Yes	Yes	No	Yes	No
Singh [22]	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Tarakji [23]	Yes	Yes	Yes	No	No	No	Yes
Trinh [24]	Yes	Yes	Yes	No	Yes	Yes	Yes

Yes this criterion was fulfilled, No this criterion was not fulfilled; ?, it was not possible to determine whether or not the criterion was fulfilled due to underreporting or unclear language

ISSN: 1749-799X