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To devise and test techniques to blind outcome assessors in trials of hip fracture fixation.
Nineteen studies [17 24, 27 35, 38, 41] included a method error analysis, and only one had blind outcome assessment [17].
We recommend placing greater credence in results when investigators at least blind outcome assessments, except with objective outcomes, such as death, which leave little room for bias.
(2) Across most types of biomedical study designs, it is prudent to blind outcome assessors (i.e., observers) in scenarios with a high risk of bias, primarily when outcomes are subjective and observers have predispositions.
We attempted to blind outcome evaluations by ensuring that allocation status was kept in a separate office from the outcome evaluation teams.
To avoid bias it is critical to blind outcome assessment of subjectively rated phenomena.
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Overall, included trials did a much better job of attempting to blind outcomes assessors than participants and personnel.
Three trials mentioned blinding, but only one trial reported that they blinded outcome assessors, the other two trials did not report who were blinded.
Furthermore, 16 studies had blinded outcome assessments, but patients were blinded in only 6 studies.
The trial design, including randomisation, blinded outcome ascertainment, and the adjusted analyses, was robust.
All included trials were at low risk of detection bias and adequately blinded outcome assessors.
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