Evidence indicates that many barriers exist to the integration of genetic case finding into primary care. We conducted an exploratory study of the determinants of three specific behaviours related to using breast cancer genetics referral guidelines effectively: ‘taking a family history’, ‘making a risk assessment’, and ‘making a referral decision’. We developed vignettes of primary care consultations with hypothetical patients, representing a wide range of genetic risk for which different referral decisions would be appropriate. We used the Theory of Planned Behavior to develop a survey instrument to capture data on behavioural intention and its predictors (attitude, subjective norm, and perceived behavioural control) for each of the three behaviours and mailed it to a sample of Canadian family physicians. We used correlation and regression analyses to explore the relationships between predictor and dependent variables. The response rate was 96/125 (77%). The predictor variables explained 38–83% of the variance in intention across the three behaviours. Family physicians’ intentions were lower for ‘making a risk assessment’ (perceived as the most difficult) than for the other two behaviours. We illustrate how understanding psychological factors salient to behaviour can be used to tailor professional educational interventions; for example, considering the approach of behavioural rehearsal to improve confidence in skills (perceived behavioural control), or vicarious reinforcement as where participants are sceptical that genetics is consistent with their role (subjective norm).
The Genetic Testing Registry (http://www.ncbi.nlm.nih.gov/gtr/docs/about/) lists tests for over 6600 genes, covering 3000 conditions. Family physicians (FPs) are often considered to be in an ideal position to provide initial genetic risk assessment and counselling to patients, and studies over more than a decade suggest that practitioners themselves agree that this is an appropriate role.1, 2, 3, 4, 5, 6, 7 However, there is little evidence that FPs are actually integrating genetic case finding into their practices,7, 8, 9, 10 and primary care may be poorly prepared for the expansion of genomics technologies, and changing patient expectations.
Family physicians need to be adequately prepared to assess genetic risk, identify, and counsel those who are eligible for referral to specialist clinics, and help plan preventive and health promotion strategies tailored to patients’ disease risks. There are multiple barriers to achieving this, including concerns about the complexities of genetic testing;5, 6 discomfort about the absence of effective interventions;4, 7 and lack of skills in collecting genetic family histories and providing appropriate counselling.3, 4, 7, 9 These influence confidence in managing patients’ concerns, and FPs may not feel adequately prepared for these roles.
The fundamental attributes of family practice are common across many health systems, but interventions designed to encourage the integration of genetics into practice need to be sustainable and cost-effective. Continuing medical education programmes offer the most widely available vehicle for initiating and supporting behaviour change. In general, small behaviour changes may be attainable through interactive educational interventions,11, 12 but their effects are likely to be limited. In relation to genetics, studies have demonstrated that educational programmes may enhance knowledge and confidence without necessarily altering utilisation of genetic counselling services13 or referral behaviour.14 A Cochrane review suggested that educational meetings alone are not effective in optimising clinical care by health professionals.15 Taken together, these observations suggest that a deeper understanding of the complex influences on health professionals’ behaviour may be required to develop educational strategies that are more finely tuned to learners’ needs, although still deliverable through current continuing medical education approaches.16, 17, 18, 19
In an effort to contribute to this understanding, we embedded a theoretically-based study within a randomised controlled trial (the GenetiKit trial, reported elsewhere).20 The trial intervention was a multifaceted ‘knowledge translation’ approach, with an interactive and peer-led educational session, a portfolio of point-of-care tools (eg, for family history taking), a ‘push’ knowledge service that provided timely, rapid, evidence-based, practitioner-friendly summaries of genetic tests in the news, and a website with reference information. Participants in the control arm received the recently developed provincial guidelines for cancer genetics referral.
The analyses presented here were based on the data collected during the pre-intervention phase. We used the Theory of Planned Behavior (TPB)21, 22 to examine the determinants of participants’ referral intentions. The TPB is one of the most thoroughly tested and robust of the social psychological models, and has well defined psychological constructs that are straightforward to operationalise.23 Meta-analyses have found the TPB useful for predicting a range of behaviours,24 particularly health behaviours.25, 26 The model has frequently been used to explore health professionals’ beliefs and intentions towards various clinical behaviours (eg, ref. 27, 28, 29, 30).
The TPB proposes that proximal determinants of a behaviour of interest are (a) the strength of an individual’s behavioural intention and (b) the degree of control felt by the individual over that behaviour.21 Behavioural intention is determined by the three constructs: attitude (being in favour of, or against, carrying out the behaviour), subjective norm (perceived pressure from others to do or not to do it), and perceived behavioural control (beliefs about factors likely to facilitate or inhibit the behaviour) (Figure 1). Demographic and personality factors are assumed to affect behaviour indirectly through their influence on attitude, subjective norm, and perceived behavioural control.21
The aim of this study was to use the TPB as a lens to examine the behaviours underlying cancer genetics referral decision making by FPs, to clarify whether tailoring continuing medical education interventions might offer a useful way forward to support the implementation of genetics in primary care.
Materials and methods
Participants and recruitment
Study participants were FPs in active practice at four locations in Ontario, Canada, who had agreed to take part in the GenetiKit trial.20
Within the general idea of ‘genetics referral decision making’ about hereditary breast/ovarian cancer, we identified three target behaviours for examination, which we explained fully in the preamble to the questionnaire:
Taking a family history when a patient presents with concerns about risk of hereditary breast/ovarian cancer (‘taking a family history’).
Using the information to make one’s own assessment of the patient’s risk of hereditary breast/ovarian cancer (‘making a risk assessment’).
Making a decision about whether or not to refer the patient to specialist genetic services, based on current guidance (‘making a referral decision’).
We selected these behaviours as clinically important and related directly to the intended use of the guideline. The dependent variable was behavioural intention, used as a proxy for actual behaviour, for two reasons. First, the primary outcome for the main trial related to responses to a set of clinical vignettes, not actual referral behaviour. Second, behavioural intention is commonly used as the dependent variable in TPB studies and has been shown to be consistently correlated with actual behaviour.31, 32
Items measuring the relevant psychological variables were derived from those developed for the previous studies, and a survey instrument was developed and piloted in its entirety using standard approaches with five FPs not involved in the study.21, 33 Supplementary Table S1 (online) provides the wording for all items in the instrument. To illustrate, we present the sample items relating to ‘taking a family history’:
‘I expect to take a family history when patients present with concerns about risk of hereditary breast/ovarian cancer’ (strongly agree/strongly disagree); (intention).
‘Taking a family history when patients present with concerns about risk of hereditary breast/ovarian cancer is (very easy/very difficult)’; (perceived behavioural control, three items).
Responses were measured on seven-point likert scales and, for analyses, responses were coded so that higher scores reflected stronger intention to perform the behaviour, more positive attitude towards the behaviour, perception of stronger social pressure to perform the behaviour, or perception of greater control over the behaviour. For each variable, a mean score was calculated from the relevant items.
Questionnaires were mailed to GenetiKit trial participants (intervention and control) in the pre-intervention phase (2006). Reminders were sent at 3 and 6 weeks. Participants were given CAD125 to partially compensate them for time spent completing questionnaires throughout the study.
Sample size and analysis
The sample size was determined by the primary outcome measures and analysis plan developed for the main trial.20 For the TPB analyses, a minimum sample size of 50+8m (where m is the number of predictors) is recommended for testing the multiple correlation in a regression equation.34 Given three predictor variables for each behavioural outcome variable, we estimated a minimum required sample size of 75.
The internal consistency of the items used to measure the TPB constructs was explored using Cronbach’s α. Spearman’s correlation coefficients were computed between all the studied variables. Multiple linear regression analyses were performed to explore the predictive value of each construct for behavioural intentions of the three target behaviours. The relative importance of predictor constructs was assessed by inspecting the standardised regression coefficients (β). Three partial correlations were computed to assess any association between two behavioural intention scores whereas controlling for the third.
The study was approved by the Mount Sinai Hospital Research Ethics Board, the North York General Hospital Ethics Board, and the Ottawa Hospital Research Ethics Board.
Of 125 FPs who consented to participate in the GenetiKit trial, 96 responded to the baseline survey (response rate 76.8%). Fifty four (56%) were females, with a mean (SD) age of 50 10 years. On average, they had been practising for 18.8 (10.8) years, with ~30 h (11.2) of direct patient care weekly. Eighty (83%) worked in medium-to-large cities and 59 (61%) worked in group practice settings.
Tables 1, 2, 3 show the mean values for the four psychological measures relating to the three behaviours. Acceptable levels of internal reliability (Cronbach’s α >0.7) were achieved except for the measures of attitude and perceived behavioural control for ‘taking a family history’ (Table 1). Internal reliability for the subjective norm was not assessed as different sources of social pressure may be perceived to exert independent effects.33 The skewness statistic for the frequency distributions (Table 1) fell within the acceptable range of −1 to 1 except for behavioural intention and subjective norms for ‘taking a family history’ and intention for ‘making a referral decision’. These were negatively skewed beyond −1, suggesting scores clustered towards the upper end of the scale. χ2-tests for homogeneity revealed no differences in intention scores between male and female physicians, or between physicians aged <50 and ≥50, for ‘making risk assessment’ and ‘making referral decision’ (P=0.783 and P=0.085, respectively). Noting a ceiling effect for intention scores relating to ‘taking a family history’, we did not conduct tests for homogeneity for this with the demographic variables.
Behaviour 1: taking a family history
As shown in Table 1, the median behavioural intention score for this behaviour (7.0) was very high, with little variation within the respondent sample. The mean scores for measures of attitude, subjective norm, and perceived behavioural control were also clearly positive, although the SD for the last (1.1) was greater than for the other measures. Using Cohen’s interpretation35 for describing the effect sizes of correlations, and relationships between the predictor measures and intention were low to moderate for this behaviour (Table 2). The multiple regression analysis (Table 3) indicated that, together, the predictor variables explained 38% of the variance in behavioural intention for ‘taking a family history’, with attitude and subjective norm both being statistically significant predictors (P<0.05).
Behaviour 2: making a risk assessment
Table 1 shows that mean scores indicating positive evaluations were observed for behavioural intention, attitude, and subjective norm, with highly variable responses (SDs in the range 1.35–1.57). The scores for this behaviour covered the entire range of possible responses, from 1 to 7, the widest observed for the three behaviours of interest. The mean score for perceived behavioural control (3.88) indicated a negative evaluation, with a similar SD (1.21) to the other measures. The correlations between the predictor measures, and between the predictor measures and behavioural intention, were moderate to high (Table 2). Together, the predictor variables explained 83% of the variance in behavioural intention for making a risk assessment, with all the three predictor variables reaching statistical significance (Table 3).
Behaviour 3: making a referral decision
The mean intention score for this behaviour (6.07) was very high, with high scores also observed for attitude, subjective norm, and perceived behavioural control (Table 1). The SD for perceived behavioural control (1.17) was highest, and for all the measures the range of responses encompassed clearly negative evaluations (<4) as well as very positive. Moderate to high correlations were observed between the individual predictor measures, and between the predictor variables and behavioural intention (Table 2). Table 3 indicates that the predictor variables explained 75% of the variance in behavioural intention, all statistically significant.
We found only one statistically significant partial correlation between intention scores, between ‘taking a family history’ and ‘making a referral decision’ (r=0.31, P<0.01).
This study was designed to understand more deeply some individual psychological factors that might facilitate or impede FPs in carrying out tasks associated with their role in genetics. Overall, we found that the TPB constructs provided useful insight into three key behaviours, and the analyses suggest potential targets for continuing medical education beyond standard information provision about genetic disorders. Separating the complex behaviour of applying referral criteria in patient assessment and management into three tasks was informative. Overall, the scores suggest very high FP intentions for ‘taking a family history’ and ‘making a referral decision’, but more moderate and variable intentions relating to ‘making a risk assessment’.
Important differences emerged when the three behaviours were compared. ‘Taking a family history’ had the most positive scores across all the variables, with extremely high and consistent scores for intention in particular. This appeared to be driven both by positive evaluations of the value of family history taking (attitude) and of this as a normal activity for FPs (subjective norm). However, the range of responses for the subjective norm and perceived behavioural control variables (and the wider SD for the latter) indicate that not all respondents rated family history taking in this context as either expected of them or as something about which they felt confident. These data suggest that although FPs appeared consistently supportive of family history taking in inherited cancer risk assessment, a proportion were in fact sceptical that this should be part of their own practice and, for some, low intentions were associated with lack of confidence in taking a family history.
In contrast, for the behaviour ‘making a risk assessment’, the analyses indicate a much broader set of reactions, such that some respondents appeared extremely positive in all respects, whereas others clearly did not intend to carry out this behaviour, saw no value in it, felt little pressure from colleagues to do it, and/or would not feel confident in doing it anyway. If valid, these observations indicate a quite different set of educational challenges.
Finally, for the behaviour ‘making a referral decision’, overall positive scores were observed, again with some heterogeneity in all the psychological measures. The perceived behavioural control variable had the largest SD, and all measures had some responses in the negative range of the scale (though not as extreme as for ‘making a risk assessment’). All three predictor variables appeared to contribute independently to behavioural intention. This is perhaps the most difficult behaviour of the three to interpret. Although we took pains to describe this behaviour carefully in the survey instrument (referral criteria being actively applied in a decision about whether or not to refer a patient for specialist assessment), and pilot tested for comprehension, it is possible that some respondents interpreted it as ‘deciding to refer’.
Taken at face value, moderate to high scores were observed for this behaviour and its predictor variables, with the range for each encompassing negative as well as extremely positive evaluations. As well as receiving the lowest mean score within this set, perceived behavioural control also had a larger SD than the other variables. All three variables statistically significantly predicted intention, and together they explained three quarters of the variance in behavioural intention.
The implications of these findings for the design of interventions to support practice improvements are presented in Table 4. We argue that interventions to support clinical behaviour change may be more effective if they are tailored to specific barriers to change.36 The recent behaviour change literature provides evidence to inform this approach. Theoretical constructs (eg, attitude and subjective norm) may be characterised in terms of ‘theoretical domains’ (clusters of similar constructs).37 Framing barriers to change in terms of theoretical domains provides a systematic method for intervention design: specific evidence-based techniques can be selected to target each domain38 and combined to design a bespoke intervention. To illustrate, Table 4 presents the key constructs that predicted intention in the present study, the theoretical domains that these constructs imply, the behaviour change techniques that would address these domains,39 and examples of how they might be delivered in the context of an educational intervention: overall, a systematic approach to tailored intervention design. Further examples of this approach are published in the implementation science literature (eg, ref. 40). The behaviour change techniques could also be delivered as part of the other approaches to enhancing quality of care, such as communities of practice, local opinion leaders, or tailored interventions.41
Tailoring of educational approaches may also need to take account of different FP roles or patient populations, for example, those with an emphasis on prenatal practice compared with those providing care across the lifespan. Genetic case finding will tend to emphasise different conditions at different life stages, and discomfort with, for example, ethical implications might vary across genetic tests and patient populations. This may introduce differences between FP groups across any of the theoretical domains, supporting the case for thoughtful educational ‘needs assessment’ as a prerequisite for intervention design.7,41
This study had several strengths. It used a well established psychological theory shown to be of value in research across many areas of clinical behaviour27, 28, 29, 30 and achieved a high response rate. In assessing multiple related behaviours, it recognises the complexity of clinical care in this area. In addition to confirming the importance of attitude, it illuminates the influence of peers and patients in promoting expectations, and the importance of identifying perceived barriers to carrying out desired behaviours. This approach lends itself to identifying modifiable predictors of behaviour for which specific interventions can be developed, and then tested formally in experimental studies.
A major limitation was the absence of objective measures of the behaviours of interest. This is often difficult because of patient confidentiality as well as logistics. A recent review of 10 prospective studies reported a correlation of 0.15–0.40 between intention and behaviour.31 A separate synthesis estimated that, on average, 28% of the variance in behaviour is accounted for by intention.32
It is likely that the GenetiKit trial participants were more interested in genetics than the average FP, thus generating higher scores for attitude and possibly other domains, limiting the study’s external validity. On the other hand, the confidence levels of this sample for genetics case finding may be higher than for the typical FP, emphasising the need for interventions that focus on behaviour change rather than information provision. The cross-sectional design also does not allow us to infer causality. We noted that our measures had lower than desirable internal consistency, which could have led to an underestimation of the strength of the true relationships. In addition, the high intention scores we observed may be explained in part by social desirability bias.
Overall, this study raises further questions. The very positively skewed results for the behavioural intention ‘taking a family history’, may reflect the targeted and condition-specific approach. We might expect that greater variation would be observed for family history taking in other contexts (eg, independent of patient complaint or guideline) emphasising importance of specifying a target behaviour very precisely. Similarly, we need to understand better why consistently lower scores on all the psychological factors were observed for ‘making a risk assessment’ compared with the other behaviours. Risk stratification criteria for hereditary cancer syndromes may be presented in ways that do not facilitate easy use by primary care practitioners, suggesting scope for improvement.42 In considering ‘education’ in a field as complex and evolving as genomics in health care, it might be productive to consider the role of point-of-care tools designed specifically to complement the focus on competencies, content knowledge, and attitudes.43
In conclusion, this study demonstrated that the application of a psychological model such as the TPB offers useful and specific insights into the factors that influence practitioners’ behaviour relating to hereditary cancer risk assessment and referral decision making. The findings suggest that, to be effective, educational approaches would need to be different for the three behaviours of interest. Future research should focus on further exploring factors influencing FPs’ practice regarding making genetic risk assessments, identifying intention-behaviour relationships, and exploring the generalisability of the findings to other aspects of genetics in primary care.
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JCC holds the Sydney G Frankfort Chair in Family Medicine. JMG holds a Canada Research Chair in Health Knowledge Transfer and Uptake. Heather Howley provided research administrative support. Project funded by Canadian Institutes of Health Research Knowledge Translation Strategies grant KTS-62357. The Health Services Research Unit is funded by the Chief Scientist Office of the Scottish Government Health and Social Care Directorates.
The authors declare no conflict of interest.
Supplementary Information accompanies this paper on European Journal of Human Genetics website
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Wilson, B., Islam, R., Francis, J. et al. Supporting genetics in primary care: investigating how theory can inform professional education. Eur J Hum Genet 24, 1541–1546 (2016). https://doi.org/10.1038/ejhg.2016.68
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