Quality versus risk of bias assessment of palliative care trials: comparison of two tools.

Abstract:

BACKGROUND:Randomised controlled trials (RCTs) of palliative care interventions are challenging to conduct and evaluate. Tools used to judge the quality of RCTs do not account for the complexities of conducting research in seriously ill populations and may artificially downgrade confidence in palliative care research. OBJECTIVE:To compare assessments from the Palliative Care Trial Assessment Tool (PCTAT) and Cochrane Risk of Bias (RoB) tool. DESIGN:Reviewers assessed 43 RCTs using PCTAT and RoB. We compared assessments of each trial, assessed overall agreement (weighted kappa (Kw)) and examined (dis)agreement for comparable items. We assessed quality of life at 1-3 months among trials grouped according to RoB or PCTAT score (using meta-analysis) and whether RoB or quality improved over time (Cochran-Armitage trend test). RESULTS:Of 43 trials, those rated low RoB had a mean PCTAT score of 73 (SD 10); those rated high RoB had a mean PCTAT score of 56 (SD 14). Overall Kw was 0.33 (95% CI 0.19 to 0.42). Total agreement between comparable items was observed for 56% of trials (24/43) and total disagreement for 21% (8/43). The standardised mean difference in quality of life was statistically significant among RCTs with low RoB and high PCTAT, but not for those with medium/low PCTAT or high/unclear RoB. Quality of reporting improved over time, whereas RoB did not. CONCLUSION:Although there was fair agreement between tools, areas of disagreement/non-comparability suggest the tools capture different aspects of bias/quality. A specific tool to evaluate quality of palliative care trials may be warranted.

authors

Isenberg SR,Kavalieratos D,Chow R,Le L,Wegier P,Zimmermann C

doi

10.1136/bmjspcare-2020-002539

subject

Has Abstract

pub_date

2020-11-18 00:00:00

eissn

2045-435X

issn

2045-4368

pii

bmjspcare-2020-002539

pub_type

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