Risk of bias within studies
Good inter-reviewer agreement was achieved on risk of
bias (Cohen’s k 0.613, 95% CI 0.359 to 0.868).21 Of the
two included trials, one was evaluated overall as high risk
of bias13 and one as unclear33 (table 3). Risk of bias was,
therefore, considered in conjunction with other indicators
of study differences (comparability of interventions,
outcome measures and timings of assessments) to
determine any appropriate quantitative synthesis of the
trials.19 Interestingly, in the subsequent reporting of the
Christensen trial,8 32 the risk of bias was improved,
although, overall, it remained high (table 3). This
suggests that poor reporting contributed to the rating of
high risk of bias for multiple issues in the original trial
report.
Risk of bias within studies
Good inter-reviewer agreement was achieved on risk of
bias (Cohen’s k 0.613, 95% CI 0.359 to 0.868).21 Of the
two included trials, one was evaluated overall as high risk
of bias13 and one as unclear33 (table 3). Risk of bias was,
therefore, considered in conjunction with other indicators
of study differences (comparability of interventions,
outcome measures and timings of assessments) to
determine any appropriate quantitative synthesis of the
trials.19 Interestingly, in the subsequent reporting of the
Christensen trial,8 32 the risk of bias was improved,
although, overall, it remained high (table 3). This
suggests that poor reporting contributed to the rating of
high risk of bias for multiple issues in the original trial
report.
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