Chow 2010.
Study characteristics | ||
Methods | Study design
Study dates
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Participants | Study characteristics
Baseline characteristics
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Interventions | Intervention classification
Intervention group
Control group
Co‐interventions
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Outcomes | Outcomes reported
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Notes | Additional information
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Risk of bias | ||
Bias | Authors' judgement | Support for judgement |
Random sequence generation (selection bias) | Unclear risk | Quote: "The study was a randomised controlled trial with a pre‐test and post‐test." Comment: Sequence generation methods were not reported in sufficient detail to permit judgement |
Allocation concealment (selection bias) | Unclear risk | Method of allocation concealment was not reported in sufficient detail to permit judgement |
Blinding of participants and personnel (performance bias) All outcomes | High risk | Not reported. However, interventions were different and participants and/or investigators could be aware of the treatment assigned |
Blinding of outcome assessment (detection bias) All outcomes | High risk | Quote: "The data were collected in 2005 at three time intervals using a structured self‐report questionnaire. [...] Data collection was through face‐to‐face interview." Comment: The outcomes were assessed with an appropriate measure, without differences between groups. However, subjective measures were used, it was not stated whether outcomes were assessed without knowledge of treatment allocation, and knowledge of treatment assignment may have influenced reporting. Participant beliefs about the superiority/inferiority of either intervention could have influenced their assessment of the outcome, but there was no evidence that this was likely. However, objective and subjective outcomes were assessed |
Incomplete outcome data (attrition bias) All outcomes | High risk | Quote: "The 100 patients who joined the study were randomly assigned to either the study or control group. There were 50 patients in each of the treatment arms. At week 12, 43 of the 50 study patients and 42 of the 50 controls had completed the follow‐up questionnaires. A total of 85 patients completed the protocol and were included in the analysis (Figure 1)." Comment: 43/50 participants in the intervention group and 42/50 participants in the control group completed the study (> 5% loss to follow‐up). Reasons for discontinuations seemed to be not related to the treatment allocation |
Selective reporting (reporting bias) | High risk | Information about the protocol and the statistical analysis plan were not reported. Fatigue was reported using multiple eligible outcome measurements (scales, time points). Fatigue was reported in a format that was extractable for meta‐analysis. All outcomes that should be addressed (fatigue, cardiovascular disease, and death) were not reported |
Other bias | Low risk | There was no evidence of different baseline characteristics, or different non‐randomised co‐interventions between groups. Funding was unlikely to influence the data analysis and authors had no conflicts of interest. The study seemed to be free from other source of bias |