Health Education Research, Vol. 15, No. 2, 131-143,
April 2000
© 2000 Oxford University Press
Are perceptions of a family history of heart disease related to health-related attitudes and behaviour?
MRC Social and Public Health Sciences Unit, 4 Lilybank Gardens, Glasgow G12 8RZ,
1 Health and Social Services Institute, University of Essex, Colchester CO4 3SQ and
2 Department of General Practice, Glasgow University, Glasgow G12 0RR, UK
| Abstract |
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It has been argued that perceptions of familial tendencies to disease are common and important in decisions about health-related behaviours. Indeed, it has been suggested that the increased `geneticization' of society may lead to an increased fatalism about health, which could undermine initiatives aimed at reducing coronary-prone behaviour. To date, much of the research on lay perceptions of inheritance has been based on people at high risk of particular genetic disorders or on qualitative research with small general population samples. Here we investigate perceptions of a family history of heart disease, using quantitative techniques, to test hypotheses about the relationship between a perceived family history (pFH), coronary `candidacy' and adherence to health promotion advice which were raised by earlier anthropological work. We find that reported perceptions of a family history of heart disease are common, particularly amongst women in middle-age. In isolation a pFH is not related to current smoking; however, the odds of smoking are lower for those with a pFH of heart disease when account is also taken of other attitudinal factors (the `salience' of heart disease and the strength of adherence to conventional coronary health promotion).
| Introduction |
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Coronary heart disease (CHD) is a major cause of morbidity and premature mortality, and is strongly patterned by social class and gender. Health-related behaviours have been identified as important risk factors for coronary disease at both a population and individual level [see (Charlton et al., 1997
Decisions about health-related behaviour are complex, and are made in the context of an individual's background and life circumstances. One factor that plays a part in this process is knowledge about the personal lives and health experiences of other family members (Davison et al., 1989
), and speculation about whether individuals follow the same trajectory through life (Richards, 1993
). In this paper we examine perceived family histories of heart disease in relation to smoking (a key behavioural risk factor for coronary disease) and relevant attitudes to health.
Background to current research
The importance of perceived family histories as a factor in decisions about health behaviours was highlighted by anthropological research into the lay epidemiology of heart disease in South Wales (Davison et al., 1992
). The research focused on `heart trouble' (a broader lay category which included CHD) and on how notions of a healthy personal `lifestyle' were considered in relation to a broader array of influences on health (Davison et al., 1992
). Knowledge of the behavioural risk factors for CHD highlighted by health promotion campaigns was found to be detailed, accurate and `almost universal' (Davison et al., 1992
), mirroring Mildred Blaxter's observation that `the public has learned well the lessons of health education' [ (Blaxter, 1990
), p. 153]. However, this knowledge was not directly associated with behaviours; not, Davison et al. argued, because of irrationality but because the knowledge of behavioural risk factors was set in a wider personal and social context. Similar observations have been noted elsewhere [see, e.g. (Ritchie et al., 1994
; Lupton and Chapman, 1995
)] and many investigators have demonstrated that decisions about health-related behaviours take place within a risk balancing framework which takes account of other pathogenic or salutogenic influences, including non-health-related benefits [see, e.g. (Backett, 1992
; Graham, 1987
; Mullen, 1992
; Mullen, 1993
)].
Davison et al.'s study also drew out key observations in relation to family history, `candidacy', and the juxtaposition of knowledge about behavioural risk factors and more fatalistic attitudes towards health. The once-held dichotomy between adherence to control of `lifestyle' and `fatalism' has little empirical support; as Pill and Stott observed, `most... respondents were probably neither out and out fatalists nor did they believe that a healthy lifestyle would guarantee complete immunity' [ (Pill and Stott, 1987
), p. 127]. Davison et al. argued that `fatalism' is not an alternative to a lifestyle-orientated viewpoint, but that more `fatalistic' explanations (and other notions such as coronary `candidacy' or `proneness') arise out of the routine observations of illness and death made within personal social networks and in the public arena. A common focus is on `anomalies' that are not `explained' by the patterns of behavioural coronary risk factors of the coronary `victim'. The emphasis of `conventional' coronary health promotion [or what has been labelled the `Health of the Nation' public health perspective (Davison and Davey Smith, 1995
)] on protection from coronary disease through the adoption of a particular personal lifestyle has thus lead to a `paradoxical effect of highlighting anomalies' [ (Davison et al., 1992
), p. 677], both `anomalous deaths' and `unwarranted survivals'. These are illustrated by widespread references to `classic' coronary `candidates' (archetypically someone who is very overweight, smokes, drinks heavily and eats `all the wrong things') who survive to a ripe old age and to the `last person' who would be expected to succumb to coronary disease (archetypically the slim, jogging, health conscious individual who unexpectedly `drops dead' of a heart attack).
One important element of `fate' that was commonly identified was the family that we are `born into'. At least half of the South Wales respondents referred to their `inheritance' from their family unprompted when asked general questions about the differential distribution of health in the community. Crucially in this context, some informants discussed their `inheritance' in their accounts of their own decisions about health-related behaviours. The benefits of individual behavioural change could thus `counteract' the effects of heredity, just as `good' and `bad' elements of one's lifestyle could be balanced against one another. Davison et al. concluded that, for those who made some kind of assessment of their own inherited risk of heart disease, there were four orientations to `lifestyle' choices that they may choose to adopt (although they suggested that only in relatively rare cases did these `logical' possibilities appear as concretely formed plans of action) [ (Davison et al., 1989
), p. 339]:
(1)I have inherited a high risk of getting heart trouble, and so I will be especially careful about smoking, weight, food and exercise.
(2)I have inherited a high risk of getting heart trouble, and so I may as well not bother to follow advice about smoking, weight food and exercise.
(3)I have inherited a low risk of getting heart trouble, and so I will build on that by being careful about smoking, weight, food and exercise.
(4)I have inherited a low risk of getting heart trouble, and so I don't have to take any notice about advice about smoking, weight, food and exercise.
In this paper we present analyses of data collected during structured interviews with large general population samples which aim to test quantitatively some of the hypotheses generated by this anthropological research. We examine the relationship between a major coronary behavioural risk factor, smoking, and perceived family history (pFH) of coronary disease, self-ascribed `candidacy' and orientations towards conventional coronary health promotion. Specifically we address the following questions:
(1)How common are perceptions of a family history of heart disease in the population?
(2)Do perceptions of a family history of heart disease relate to other attitudes and beliefs about heart disease aetiology and prevention?
(3)Are perceptions of a family history of heart disease related to smoking?
| Method |
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Subjects
Data are presented from the West of Scotland Twenty-07 study, a longitudinal study of the social patterning of health amongst three age cohorts, aged 15, 35 and 55 when first studied in 1987/88. Respondents were sampled from residents in the Central Clydeside Conurbation, a socially varied but mainly urban area centred on Glasgow. Initial sample sizes in 1987/88 were around 1000 per cohort. Respondents have completed lengthy home-based structured interviews on two subsequent contacts in 1990/91 and 1995/96. Further details on the sample and methods are available elsewhere (Ecob, 1987
Data are presented here from the 1995/96 interviews, when 676 people in the youngest cohort (then around 23 years), 754 in the middle cohort (then around 43 years) and 723 people in the oldest cohort (then aged around 63 years) were re-interviewed in their own homes by nurses trained in interview techniques. A wide range of measures of self-reported health and health behaviour, of physical development and functioning, and of personal and social circumstances has been collected at each face-to-face contact. In 1995/96, this included a number of questions that were specifically designed to explore the relationship, if any, between perceptions of family history of illness and health attitudes and health-related behaviours. Respondents were asked about health and deaths in the family (reported numbers of close and more distant family with specified illnesses or conditions, etc.); perceptions of illnesses and weaknesses that run in their own family; their own perceived vulnerability to a number of conditions, including heart disease; and a range of health attitudinal questions that were intended to be related to these perceptions. The questions on family deaths and family health appeared earliest in the questionnaire, and were separated from questions on current health behaviours by another large section of the questionnaire. The main block of questions on perceived family histories and attitudes towards the salience and implications of these appeared towards the end of the questionnaire.
Measures
A summary of the basic descriptive characteristics of the sample is shown in Table I
.
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Socio-demographic variables
Age (23, 43, 63 years), gender (men, women), housing tenure [owner-occupiers versus others; this was chosen as main indicator of socio-economic status (SES) since many in the youngest cohort were not in the labour force at 23 and had to be classified according to their class of origin].
Perceptions of family history (pFH)
Respondents were asked the following question: `Some people think that particular illnesses or weaknesses run in their families, others don't. Do you think that there are any conditions, weaknesses or illnesses which run in your family?'. Nurses asked those who responded positively which illnesses or weaknesses ran in their families, but were instructed not to probe so that respondents were not presented with any lists of illnesses or conditions. The nurses recorded as many conditions as the respondents mentioned unprompted by allocating their responses to pre-defined codes, including `heart disease or heart trouble'. This was intentionally broad (including both specific references to ischaemic heart disease and angina, for example, and less specific references to `heart trouble' and `heart problems') because previous research and pilot work had indicated that these terms were commonly used when discussing heart disease.
Health attitudinal variables
Respondents were presented with a series of statements.
Factors in the aetiology of heart disease. Respondents were asked to indicate (on a five-point scale) how important they thought various factors were in the aetiology of heart disease; these included `housing and living conditions', `aspects of lifestyle like smoking, drinking and diet', `illnesses and weaknesses that run in the family' and `stress in daily life'.
Adherence to conventional coronary health promotion. Respondents were assigned to three groups (very high, mid and low) according to the strength of their agreement with three statements (five-point scale, from agree strongly to disagree strongly): `If heart trouble runs in someone's family (a) ...it is particularly important for them not to smoke; (b) ...it is particularly important for them to take exercise; (c) ...it is particularly important for them to eat a healthy diet'. Only a few were ambivalent about or disagreed with the statements. Those who strongly agreed with all three statements were assigned to the `very high' adherence group; those who failed to agree (i.e. were ambivalent, disagreed or disagreed strongly) with one or more of the statements were assigned to the `low' adherence group; the remainder who agreed with all of the statements but said `just agree' (rather than `strongly agree') to at least one of the statements were allocated to the `mid' adherence group.
Adherence to `fatalism'. Respondents were asked the extent to which they agreed (five-point scale, from agree strongly to disagree strongly) with the statement: `If heart trouble runs in someone's family it doesn't matter what they do; whether they get heart disease or not is out of their hands'. Those who disagreed strongly were classed as having low, those who agreed (strongly or just) were classified as having high and the remainder as having middling `fatalism'.
Self-ascribed coronary `candidacy'. Respondents were asked how likely they thought they were to get heart disease. Those who said they were very or quite unlikely to develop heart disease or that they did not know are contrasted for the purposes of this analysis with those who said that they were very or quite likely to get it, and those who already had heart disease. For brevity we describe this as `salience' in this paper. Table I
shows that, as expected, the salience of heart disease increases with age.
Smoking
Current smokers (one or more cigarettes per day) are contrasted with never or ex-smokers. The prevalence of smokers was around a third in each cohort (Table I
).
Analysis
Reports of a perception of family history of illness were examined by age, and by gender and SES within age. The health attitudes of those with and without a pFH of heart disease were also compared within age. A series of logistic regression models examined the relationship between pFH, each of these attitudinal factors and smoking, controlling for SES, sex and age, and then examined the relationship between a pFH and smoking in more detail. Unless otherwise stated, the reference category is the first mentioned category in the description of measures above. We also tested for interactions between a pFH and the socio-demographic and attitudinal variables.
| Results |
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Prevalence of pFH
A substantial proportion, around 40%, reported having some kind of family history of illness (Table II
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Around 20% in each cohort said that they had a family history of heart disease or heart trouble; this was the most commonly mentioned illness. The prevalence did not differ by cohort or by SES, but again women were more likely to report a family history of heart trouble than men. Perception of a family history of heart disease was very strongly related to reported number of relatives who had ever had heart disease (Table III
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Relationship of pFH of CHD to health attitudes
In each cohort a pFH of heart disease was strongly related to self-ascribed candidacy (salience); about twice as many without a pFH described themselves as unlikely to get heart disease (Table IV
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Table VI
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pFH of heart disease, health-related attitudes and smoking
As shown in Table I
Table VII
shows results of four logistic regression models which examine the relationship of smoking to (a) pFH of heart disease, (b) salience, (c) adherence to health promotion and (d) degree of fatalism. People who described themselves as more vulnerable to heart disease, who had the lowest adherence to health promotion advice for the prevention of heart disease and who had the most fatalistic attitudes to heart disease were significantly more likely to be smokers. However, in isolation, a pFH was unrelated to smoking (see Tables VII
a and VIII
, model 1).
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Table VIII
A series of further logistic regression models tested for interactions between these attitudinal variables (salience, adherence to health promotion, fatalism and pFH), and between these variables and the socio-demographic variables (age, sex and tenure) (data not shown). The only significant interaction was between pFH and adherence to health promotion (P < 0.05). Those with a pFH of heart disease and the strongest adherence to conventional health promotion had the lowest odds for smoking (0.29, 95% CI 0.120.71). The inclusion of this term rendered the main effect of pFH non-significant.
| Discussion |
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Most research on perceptions of family history has involved participants from `high-risk' groups or families, from clinical populations or has used small general population samples. We demonstrate here that, in a large-scale general population sample, perceptions of family history (familial weaknesses and tendencies) in general, and of heart disease in particular, are a common and an important element in lay epidemiology and risk formulation. This supports other smaller studies which have shown that `family history' figures highly in popular (and professional) accounts of the aetiology of major diseases, including `heart trouble' (Davison et al., 1989
Although there is increasing interest in lay perceptions of familial risk (and inherited susceptibilities to common diseases with a multi-factorial aetiology), few studies have related such perceptions to relevant attitudes or behaviours (Ponder et al., 1996
). Marteau et al. (Marteau et al., 1995
) have also argued that little is known about how self-assessments of coronary risk relate to epidemiologically defined risk. Their research suggests that family history of heart disease is one of the coronary risk factors that is accorded more weight by the lay public than by epidemiologically derived indices of risk, perhaps because greater weight is given to `visible' risk factors (such as weight or family history) rather than to `hidden' ones (such as cholesterol level or blood pressure) (Marteau et al., 1995
). We have shown here that people who say they have a family history of heart disease are more likely to see themselves as `at risk' of heart disease and to think behavioural risk factors have an important influence on the development of heart disease; however, they were no more or less likely to have a `fatalistic' attitude towards heart disease. People who think they have a family history of heart disease and see themselves as at risk of the disease are much less likely to smoke.
We have concentrated here on perceptions of family history of heart disease, as any `risk-balancing' in behavioural decisions clearly has to be mediated through an individual's own perceptions of risk (which may or may not concur with external evaluations) (Love et al., 1985
). We dichotomized people into `having' or `not having' a family history of heart disease on the basis of their responses to two simple questions. Survey methods such of these leave little room for the expression of ambiguity or qualification. Further research using qualitative methods has demonstrated that deciding whether or not one has a family history is not always straightforward (Emslie et al., submitted). Whilst coronary events in the family are a necessary condition, they are not sufficient. As we have seen here, there is a strong relationship to the number of relatives (particularly close family members), but other factors are carefully considered before familial coronary events are attributed to a familial tendency. For example, older family members are `discounted' by people when weighing up whether they have a family history of heart disease (Emslie et al., submitted). This may account for our observation that fewer among the oldest (63 year) cohort who reported having three or more close family members who had had heart disease regarded themselves as having a `family history' than among people in early mid-life (43 year cohort).
In the current paper we could only examine the relationship between a pFH and number of affected relatives on the basis of respondents' own reports of family ill-health. However, research in another population in the west of Scotland has demonstrated a high degree of accuracy of reporting of parental (age at and cause of) death in comparison with the information recorded on death certificates (Watt et al., submitted). Other studies which have compared medical and lay perceptions of family history suggest that knowledge about family history seems to be higher for heart disease (Kee et al., 1993
) and cancer than for other chronic conditions, to be acquired at an early age (Hastrup et al., 1992
), and to be highest for first-degree relatives (Love et al., 1985
).
The finding that current smoking is related to perceptions of family history of heart disease in the context of other attitudes is relevant for health promotion. The reduction of coronary heart disease continues to be a major public health priority (Scottish Office, 1999
); the government has recently stated that: `tackling smoking is central to cutting deaths from cancer and heart disease. Tackling smoking is central to improving health in Britain' (Department of Health, 1998
). At the time that these data were collected, the strategic health promotion policy aims which were focused on the general public in Scotland were to `influence people's health-related knowledge, motivations and skills' [ (Health Education Board for Scotland, 1997
), p. 1)] Research, including that reported here, shows that the public are generally well-informed about the behavioural risk factors for CHD, e.g. the Health Education Board for Scotland's own monitoring has suggested that `Respondents showed high awareness of the importance of not smoking, taking regular exercise and having a healthy diet' [ (Health Education Board for Scotland, 1997
), p. 4]. Our data were collected prior to the recent shift in public health policy to an explicit recognition that health-related behaviours are important contributors to inequalities in health and `are linked strongly to social class and underlying life circumstances' (Scottish Office Department of Health, 1998
; Scottish Office, 1999
).
Although recent studies suggest that notions of familial inheritance may be important influences on attitudes, behaviour and (in)action, at present there is a paucity of empirical information about how people deal with thoughts, beliefs and information about their own inherited predisposition (Green et al., 1993
; Richards, 1993
; Macintyre, 1995
). Macintyre has argued that, `A particularly important question is whether what has been called `the increasing geneticization of society' will lead to an increasingly general scepticism about the capacity of behaviour modification to improve health, and a consequent rejection of health promotion messages' [ (Macintyre, 1995
), p. 230]. Richards too has suggested that `geneticization' may lead to fatalism about health, disease and life chances in general becoming more common (Richards, 1993
). The quantitative data presented here support the view that a pFH of heart disease is important in decisions about smoking but its role in individual formulations of risk may only be understandable in the context of an array of other perceived risks that are `weighed' or `balanced' against this perception. It is increasingly accepted that both health promotion and interventions negotiated in clinical practice (Brorsson et al., 1995
; Stott et al., 1995
) are more likely to be well received and effective when based on a clearer understanding of cultural norms informing health beliefs, attitudes and practice (Backett and Davison, 1995
; Kreuter and Strecher, 1995
; Butler et al., 1998
). We would thus argue that understanding people's construction of familial risk of heart disease is important for health promotion as it is common and linked to behavioural risk factors for coronary disease.
| Acknowledgments |
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The authors gratefully acknowledge all those involved in the Twenty-07 Study, particularly the participants, the interviewers, Geoff Der who provided statistical advice, and Lindsay Macaulay, Patricia Fisher, Margaret Reilly and Barbara Jamieson. K. H. and G. F. are employed by the Medical Research Council of Great Britain who fund the Twenty-07 Study. C. E. is supported by ESRC grant no. L128251028. Sally Macintyre and the journal's reviewers provided helpful comments on an earlier draft.
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Received on August 28, 1998; accepted on May 30, 1999
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