From: Six ‘biases’ against patients and carers in evidence-based medicine
Nature of bias | Impact on process of care | Impact on outcome | How this bias might be minimised |
---|---|---|---|
1. Most published research had minimal patient input | Example: evidence relates to options and outcome measures that patients themselves would not have chosen | The available menu of evidence-based choices reflects a biomedical framing and omits options that might be more acceptable and effective | Patient and public input to setting research priorities, study design, choice of outcome measures, and interpretation and dissemination of findings must be prioritised and effectively resourced |
Recruitment methods to trials address only a fraction of the population | Study findings apply only to this sub-population | Diverse and questioning patient/carer steering group may help recruit more diverse and representative samples | |
2. EBM’s hierarchy of evidence tends to devalue the patient or carer experience | Abstracted evidence from population samples is given more weight than real, individual evidence from this patient/carer | The patient is effectively ‘regressed to the mean’ and offered the option(s) that the average patient would benefit most from | ‘Personally significant evidence’ from a particular patient in the here and now should be systematically captured and treated as complementary to ‘statistically significant evidence’ from distant research populations |
Qualitative evidence, even when robust and relevant, is rarely used to its full potential | Personalisation of care lacks nuance and context, because research addressing ‘how’, ‘why’, and ‘in what circumstances’ has not been used | Narrative, phenomenological, and ethnographic research designs should be viewed as complementary rather than inferior to epidemiological evidence – though qualitative, like quantitative, research must be appraised for rigour and relevance | |
3. EBM conflates patient-centredness with use of shared decision-making tools | The ‘patient’s agenda’ is framed through a medical lens and reduced to a series of decisions about tests and treatments | Humanistic aspects of the consultation (empathy, compassion, the therapeutic alliance) are devalued and may be overlooked | Working with humanities scholars and psychologists, EBM researchers should acknowledge and incorporate interdisciplinary approaches to extend and complement their current focus on shared decision-making |
4. Power imbalances may suppress the patient’s voice | Much of the patient’s agenda will not get aired in the consultation | Advice that is given, and management plans that are ‘agreed’, may be ignored (but may be inappropriate anyway since they are based on a partial picture) | Working with social and political scientists, EBM researchers should collect and apply evidence on how to make consultations more democratic (see main text for examples) |
5. EBM over-emphasises the clinical consultation | Clinicians underestimate the extent of self-management and the value of lay networks (in which people support and inform one another) both face-to-face and virtual | Clinicians and researchers focus on ‘interventions’ that they can deliver instead of considering how they can support models of care in which they are no longer central | Working with social scientists, EBM researchers should become comfortable with naturalistic designs for studying the patient in a real-world context and exploring the dynamics of social networks and online groups from a complex systems perspective |
6. EBM is concerned mainly with people who seek (and can access) care | People with greatest need for evidence-based care are least likely to receive it | A ‘hidden denominator’ of hardest-to-reach sub-populations may remain undiscovered, hence EBM may appear to have solved more problems than it actually has | EBM researchers should embrace more explicitly a public health agenda, in which preferred study designs may be observational and developmental (including participatory co-design) rather than controlled experiments |