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Hans Bosma Erasmus University Rotterdam, Department of
Public Health, PO Box 1738, 3000 DR Rotterdam, Netherlands
Correspondence to: Dr Bosma
bosma{at}mgz.fgg.eur.nl
Objective:
To determine the contribution of
psychological attributes (personality characteristics and coping
styles) to the association between social class in childhood and adult
health among men and women.
There is now increasing evidence that differences in adult health
are partly caused by socioeconomic factors during early life and
upbringing.1-5 The causal mechanisms relating adverse socioeconomic conditions in childhood and poor health in adulthood have
not yet been examined extensively. Biological mechanisms, such as
hypertension and hypercholesterolaemia, have been
suggested,6-8 and there is some evidence for mechanisms
related to lifestyle, such as smoking and physical
activity.
3 9-12
With few exceptions the contribution of
psychological attributes, such as personality factors and coping
styles, has hardly been examined.
10 13 14
Psychological
attributes are partially rooted in environmental conditions in
childhood, (learning) experiences, and rearing
styles.14-16 There is now also increasing evidence that
psychological attributes influence health through behavioural
mechanisms (for example, smoking) or direct physiological
mechanisms, or both.17 Unhealthy personality factors and
coping strategies may, therefore, be mechanisms through which
adverse socioeconomic conditions in childhood contribute to poor health
in adulthood. Baseline data from the Dutch GLOBE study (a Dutch study
on health and living conditions of the population of Eindhoven and its
surroundings) allowed us to examine whether childhood social class is
related to psychological attributes and whether psychological
attributes are mediating factors in the association between social
class in childhood and adult health. To obtain the direct effects, we
accounted for adult social class separately.18
Study population
Social class, psychological attributes, and health outcome
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Abstract
Top
Abstract
Introduction
Subjects and methods
Results
Discussion
References
Design:
Partly retrospective, partly cross sectional study conducted in the framework of the Dutch GLOBE study.
Subjects:
Sample of general population from south east Netherlands consisting of 2174 men and women aged 25-74 years. Baseline
self reported data from 1991 provided information on childhood and
adult social class, psychological attributes, and general health.
Main outcome measure:
Self rated poor health.
Results:
Independent of adult social class, low
childhood social class was related to self rated poor health (odds
ratio 1.67 (95% confidence interval 1.02 to 2.75) for subjects whose fathers were unskilled manual workers versus subjects whose fathers were higher grade professionals). Subjects whose fathers were manual
workers generally had more unfavourable personality profiles and more
negative coping styles. External locus of control, neuroticism, and the
absence of active problem focused coping explained about half of the
association between childhood social class and self rated poor health.
The findings were independent of adult social class and height.
Conclusions:
A higher prevalence of negative
personality profiles and adverse coping styles in subjects who grew up
in lower social classes explains part of the association between social
class in childhood and adult health. This finding underlines the
importance of psychological mechanisms in the examination of the
negative effects of adverse socioeconomic conditions in childhood.
Key messages
![]()
Introduction
Top
Abstract
Introduction
Subjects and methods
Results
Discussion
References
![]()
Subjects and methods
Top
Abstract
Introduction
Subjects and methods
Results
Discussion
References
Data were collected within the framework of the GLOBE study. A
postal survey was conducted in 1991 among 27 070 non-institutionalised
inhabitants (aged 15-74 years) of Eindhoven and a number of surrounding
municipalities, all in the south eastern part of the Netherlands.
Stratified by age and post code, the sample was randomly drawn from the
municipal population registries. People aged 45-70 years old and people
from the highest and lowest social classes were overrepresented to
allow specific analyses for middle aged subjects and to increase
socioeconomic contrasts. The response rate was 70.1%, which resulted
in a study population of 18 973. The response rates were not
substantially different for age, sex, marital status, level of
urbanisation, or social class.19 A few months later a
subsample of those who responded to the postal questionnaire was
approached for a more extensive oral interview. This subsample
consisted of 3529 randomly chosen respondents to the postal
questionnaire, of whom 2802 agreed to be interviewed (79.4%). The
response rates hardly differed for relevant demographic
characteristics. More details on the study design can be found
elsewhere.19 To allow for a more valid measurement of
adult social class the analyses were restricted to men and women older
than 24 years (n=2462). The analyses were based on subjects who
reported both their father's and their own adult occupational level
(n=2174).
Adult social class was measured by the respondent's current or
last occupational level. Childhood social class was measured
retrospectively by the father's occupational level when the respondent
was 12 years old. If the father was not in paid employment the
father's last occupation in paid employment was used. The occupations
of both the respondent and the father were classified according to the
scheme of Erikson, Goldthorpe, and Portocarero.20 The
psychological attributes were assessed by questionnaires on personality
characteristics and coping styles. The personality characteristics were
external locus of control (low perceived control),
21 22
neuroticism (emotional distress),23 parochialism (a
narrow, local, and non-scientific attitude),24-26 and
orientation towards the future.
25 26
Seven typical styles of coping were distinguished: active problem focusing, avoidance behaviour, depressive reaction pattern, social support seeking, palliative reaction pattern, disclosure of emotions, and
optimism.27 The items were summed for the separate scales
and then divided into thirds.
Statistical analysis
Childhood social class and the psychological attributes were
related by logistic regression analysis with adjustment for age and
sex. For this analysis the psychological attributes were divided into
two categories by combining the lowest two thirds. This analysis
provided adjusted estimated percentages. Childhood social class and
adult health were also related by logistic regression analysis
controlled for age, sex, marital status (married, single, widowed/divorced), religious affiliation (none, Catholic,
Protestant/other), and level of urbanisation (four levels). To examine
the contribution of psychological attributes to the association of
childhood social class and adult health, the psychological attributes
(in thirds) were separately introduced into a model with childhood
social class and confounders. As we were primarily interested in the direct effects of childhood social class on adult health, all analyses
were separately adjusted for adult social class. Self reported height
as a proxy for factors in early life was also separately controlled
for. As the findings for men and women were similar, we combined data
for both and controlled for sex.
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Results |
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Table 1 shows that childhood social class was related to
personality. External locus of control (42% v 15%),
parochialism (35% v 12%), neuroticism (34%
v 23%), and lack of future orientation (41%
v 27%) were more prevalent in the lowest compared with
the highest social classes in childhood. The prevalence decreased almost linearly from lowest to highest class but was somewhat less
clear for neuroticism. Low childhood social class was also related to
particular coping styles
that is, a lower prevalence of active problem
focused coping (20% v 40%), a somewhat more frequent
depressive reaction pattern (26% v 18%), avoidance
(28% v 22%), less often seeking social support (21%
v 36%), and less often expressing emotions (26%
v 35%). Except for active problem focused coping, these
associations were not linear. When we controlled for adult social class
the associations were weaker, but most remained.
Table 2 shows that childhood social class was related to poor general health. Subjects with a low childhood social class were 2.1 times as likely to rate their health as poor than subjects with a high childhood social class. Adjustment of this odds ratio for adult social class decreased the odds ratio to 1.67, which was still significant.
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Two personality factors and one coping style contributed to the
association between childhood social class and adult health: external
locus of control, neuroticism, and the absence of active problem
focused coping. The other personality and coping factors individually
explained less than 10% of the gradient (data not shown). External
locus of control had the strongest contribution to the socioeconomic
gradient in poor general health. When external locus of control was
taken into account, the odds ratio for subjects whose fathers were
unskilled manual workers decreased by 46% in the model without adult
social class controlled for (odds ratio 1.60 in model 1) and by 33% in
the model with adult social class controlled for (1.45 in model 2).
This was closely followed by neuroticism (32% and 34%, respectively).
Active problem focused coping explained a smaller part of the increased
risk
namely, 18% and 8%, respectively. When the three psychological
attributes were considered simultaneously, about half of the
association of low childhood social class with poor general health
could be explained by a higher prevalence of external locus of control and neuroticism and a lower prevalence of active coping styles in
subjects with a low childhood social class.
Height hardly affected any of our findings (data not shown). Less than
7% of the association between childhood social class and adult health
was explained by height. Further adjustment for external locus of
control, neuroticism, and active coping explained an additional 50% of
the association. This is similar to the results of analyses without
adjustment for height. Furthermore, we found no evidence for
interactions between childhood and adult social class or between
childhood or adult social class and personality or coping styles (data
not shown).
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Discussion |
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We have shown that particular personality factors and coping styles substantially contribute to the direct association between social class in childhood and adult health. Subjects whose fathers were unskilled manual workers generally had more unfavourable personality profiles and negative coping styles. External locus of control, neuroticism, and the absence of active problem focused coping explained half of the association between low social class in childhood and poor general health. The lack of influence of height may suggest a contributing role of psychological attributes and not just of fetal development and early growth.7 Given the finding that childhood social class may be particularly related to cardiovascular diseases,1 it is worth mentioning that we found similar results for reporting a severe heart condition or stroke (not shown). These findings, however, were not significant because of small numbers. Our findings suggest that psychological attributes are worth examining when the associations between social class in childhood and adult health are studied. 10 13 14
These findings indicate that personality is partially rooted in
childhood social class. Rearing styles differ among social classes,
resulting in long term effects on behaviour, emotion, and
cognition.
15 16
Children from high class backgrounds may more easily experience and learn a sense of mastery and control because
their parents have more resources (for example, money and
knowledge).30-32 This may underlie our findings with
locus of control and active problem focused coping. Similarly,
neuroticism may also reflect or be the consequence of a perceived lack
of control over outcomes and events.33 Neurotic people may
more easily internalise emotions instead of taking problem oriented approaches. Our findings emphasise the importance of control related psychological factors for the development of socioeconomic inequalities in health.34 Further research should examine whether
perceived control is related to physical health through its impact on
health behaviours or physiological mechanisms, or both. Our findings also suggest that intervention programmes should take account of
relevant psychological pathways
for example, through emphasising and increasing control beliefs in people from lower socioeconomic backgrounds
as advocated by the empowerment approach.35
Increasing control beliefs in those without real control may be futile,
however, because intervention on control beliefs per se may do little
to the structural determinants which generate these
beliefs.
10 35
Methodological considerations
A few methodological issues should be considered. Firstly, the
design was cross sectional, whereas the ideal design would be to follow
a cohort from birth into adulthood. This would allow a better
examination of the causal pathways between childhood social class,
psychological attributes, adult social class, and adult health. Our
theoretical causal model was based on previous research that showed
little effect of adult health on adult social class.
36 37
Another assumption was that personality affects adult health and not
vice versa. Although there is clear evidence of such a causal
relation,17 reverse causation cannot be completely excluded.38 Furthermore, we were primarily interested in
the direct effects of childhood social class
that is, independent of
adult social class. If specific personality traits affect occupational achievements, however, the contribution of personality and coping to
any association will be underestimated when adult social class is
adjusted for. On the other hand, adult socioeconomic conditions are
likely to affect components of adult personality and coping styles.
This suggests the importance of controlling for adult social class.
Given this dilemma we presented findings both adjusted and unadjusted
for adult social class.
that is, self reported cardiovascular diseases
(mentioned above; data not shown). The role of neuroticism is relevant
here as it is sometimes used as a proxy measure for negative
affectivity, and it contributed strongly to the association (both
general health and cardiovascular health). Given the association with
the more "objective" health outcome (cardiovascular diseases) we
prefer to interpret neuroticism as reflecting worry about lack of
control33 instead of negative affectivity. Worry about
lack of control has recently been shown to be correlated with an
increased risk of coronary heart disease.40 To exclude the
possibility of reporting bias as much as possible, further research
should use alternative, more objective information on the health outcomes.
Thirdly, self reported height was an imperfect measure of early life
factors related to prenatal and postnatal growth, and related
biological consequences, because it was self reported and because adult
height reflects more than just early growth.41 Fourthly,
the inclusion of other psychological mechanisms, such as feelings of
parental caring,42 childhood
conscientiousness,43 and attachment via
hostility,44 may have had an additional contribution to
the association between childhood social class and adult health. Finally, the 288 people for whom data on social class in childhood or
adulthood were missing had lower educational levels and poor general
health than those who responded to both questions (not shown). This
partial non-response is likely to have resulted in underestimated
associations between childhood social class and adult health.
Conclusions
Adverse socioeconomic conditions in childhood are related to poor
general health in adulthood. Unhealthy psychological attributes
(personality factors and coping styles) are more common in people who
reported low childhood social class. Specific psychological attributes
contribute substantially to the association between childhood social
class and adult health. Perceived control may be the underlying
psychological characteristic. When the influence of childhood
socioeconomic conditions on adult health is examined the role of
specific psychological attributes is worth further exploration, in
addition to factors related to fetal development, early growth, and
biological and behavioural mechanisms.
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Acknowledgments |
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The study was conducted in close collaboration with the Public Health Services of the Dutch city of Eindhoven and the region of South East Brabant. We thank Michel Provoost and Ilse Oonk for carefully constructing the database and Carola Schrijvers and Mariel Droomers for their useful comments on previous drafts of the paper.
Contributors: HB was the main author and carried out the analyses, interpreted data, and responded to referees' comments. HDvdeM formulated the hypothesis, helped with writing and responding to referees' comments, carried out preliminary analyses, and was partly responsible for data collection. JPM was principal investigator, formulated the hypothesis, helped with writing and responding to referees' comments, was responsible for data collection and is guarantor for the study.
Funding: Dutch Ministry of Public Health, Welfare, and Sports and the Dutch Prevention Fund.
Competing interests: None declared.
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References |
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or support and talking?
J Health Soc Behav
1989;
30:
206-219[Medline].(Accepted 20 October 1998)
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