- Research article
- Open Access
Child maltreatment and hypertension in young adulthood
BMC Public Health volume 14, Article number: 1149 (2014)
Maltreatment during childhood and adolescence has been associated with chronic conditions in adulthood including cardiovascular disease. However, less is known about the effects of childhood maltreatment on cardiovascular risk factors prior to development of cardiovascular disease, or whether these effects are evident in young adulthood. Furthermore, few studies have examined sex differences and most studies have relied on self-reported outcome measures that are subject to misclassification.
We examined the relationship between child maltreatment and hypertension in young adulthood in the National Longitudinal Study of Adolescent Health, a nationally representative school-based sample of US adolescents. Participants retrospectively (mean age 29.9, n = 11384) reported on their experiences of child maltreatment prior to the 6th grade (prior to age 11) during follow-up. Child neglect, physical and sexual violence as well as a measure of social services visits to the home were examined. Blood pressure was measured during an in-home visit. Hypertension was defined as measured SBP of at least 140 mmHg or DBP of at least 90 mmHG measured in adulthood, or self-reported use of antihypertensive medications.
In adjusted models, women who experienced sexual abuse in early childhood had a higher prevalence of hypertension (Prevalence Ratio (PR) 1.43 95% CI 1.00, 2.05) compared to women who did not experience sexual abuse. Among men, experiencing sexual abuse was not statistically significantly associated with hypertension. Experiencing neglect, physical abuse or having visitations by social services at home during childhood was not associated with hypertension among either women or men.
Sexual abuse in early childhood is associated with hypertension in young women.
Childhood maltreatment is a toxic stressor prevalent in the United States (US) . The US state and local child protective services (CPS) estimate that 686,000 children were victims of some form of maltreatment in 2012 . Recent data from the Behavioral Risk Factor Surveillance System (BRFSS) shows that 15% of adults report experiencing physical maltreatment during childhood. Maltreatment during childhood and adolescence has been associated with chronic conditions in adulthood including cardiovascular disease [1, 3, 4]. However, less is known about the effects of childhood maltreatment on cardiovascular risk factors prior to development of cardiovascular disease, or whether these effects are evident in young adulthood.
Only a handful of studies have explored the effects of childhood maltreatment and blood pressure in adulthood [5–8]. Using the Nurses Health Study II data, Riley and colleagues noted an association between severe and frequent experiences of child maltreatment and self-reported hypertension . An analysis using the World Mental Health Survey demonstrated that experiencing physical abuse during childhood is associated with self-reported hypertension in adulthood . In contrast, a study conducted among young adults in the US noted no significant association between child maltreatment and self-reported hypertension . Other studies have noted significant associations only among women experiencing sexual abuse and not with other forms of child maltreatment .
Methodological limitations of the extant literature contribute to the discrepancy in study results and make it challenging to draw definitive conclusions. First, the vast majority of studies have relied on self-reported hypertension [7–9]. NHANES data has demonstrated that only 83% of hypertensive adults over age 18 are aware of their hypertension , thus, use of self-reported hypertension would underestimate the true prevalence of hypertension and potentially bias results toward the null. Second, most studies have not examined sex differences. Childhood maltreatment has been shown to differ between boys and girls, with girls more likely to experience sexual abuse compared to boys . Furthermore, hypertension is more prevalent in men. Men are also more likely to be unaware of their blood pressure status but less likely to be taking antihypertensive medication , highlighting the importance of relying on measured blood pressure status to minimize misclassification. Third, differential behavioral responses to stress or physiological mechanisms may contribute to potential sex differences. Previous research has documented that, compared to women, men may be more likely to cope with stress by engaging in behaviors (i.e., smoking, alcohol consumption) which may contribute to elevated blood pressure . Furthermore physiological responses to stress such as HPA axis dysregulation and inflammation have been noted to differ between sexes [14–17]. Thus, it may be important to examine sex differences in the relation between child maltreatment and hypertension.
In this study we examined child maltreatment and hypertension within the National Longitudinal Study of Adolescent Health (Add Health) a nationally representative longitudinal cohort of adolescents followed through young adulthood. Hypertension in young adulthood is a known risk factor for cardiovascular disease in adulthood. We focus on maltreatment that occurred early in childhood, prior to age 11. We improve upon other studies by using measured blood pressure to define hypertension, examining whether sex differences exist on the relationship between child maltreatment and hypertension, and examining the issue in a nationally representative sample.
The Add Health study is a nationally representative school-based, longitudinal study of the health-related behaviors of adolescents and their outcomes in young adulthood. An in-school questionnaire was administered to a nationally representative sample of students in grades 7 through 12, plus selected oversampled minority groups, stratified by age and sex, during the 1994–1995 school year in 132 schools. Four waves of in-home interviews (Wave 1, 1994–1995; Wave 2, 1996; Wave 3, 2001–2002; Wave 4, 2007–2008) were conducted. The study design has been described in detail elsewhere . Briefly, 80 high schools representative of US schools were selected with respect to region of country, urbanicity, size, type and ethnicity. Eligible schools included an 11th grade and enrolled more than 30 students. The first wave of in-home interviews was conducted between 1994 and 1995 (Wave 1), and approximately 20,745 adolescents, between the ages of 12 and 18 completed the in-home questionnaire at that time. Follow-up interviews for waves 3 (2001–02; response rate 77.4%) and 4 (2008–09; response rate 80.3%) were conducted with individuals who had participated in wave 1, leaving 12,288 participants who had sampling weight information. In the current analyses, those who were pregnant during wave 4 or who were missing blood pressure data were excluded, as well as those missing information on socio-demographics and covariates of interest leaving 11,384 as the final sample for our analyses. Participants who were included in the final sample differ from the full sample based on race/ethnicity. We used longitudinal sampling weights, available for participants followed to Wave 4, which adjust the sample to be representative of sample characteristics at baseline. The Add Health study was approved by the institutional review board of the University of North Carolina, Chapel Hill. The institutional review board of Columbia University, New York approved these analyses.
Blood pressure assessment
During the fourth wave of follow-up (2007–2008, mean age 29) an in-home assessment was conducted and three blood pressure measurements were obtained with a Micro Life automated blood pressure monitor after the participant was seated for five minutes. The average of the last two measurements were used to calculate the average systolic blood pressure (SBP) and diastolic blood pressure (DBP). Participants were asked to provide to the interviewer all medications they were currently taking or had taken in the previous six months. Antihypertensive medications (beta-adrenergic blockers, calcium channel blockers, angiotensin converting enzymes) were identified from all medications provided. Hypertension was defined as having an elevated systolic blood pressure > = 140 mmHg or diastolic > = 90 mmHg (N = 2121) or reported using antihypertensive medications (N = 379).
During the 3rd wave of follow-up participants (Mean age 21.0) were retrospectively asked whether they had been the victims of abuse or neglect by their parent or caretaker when they were children by the time they started 6th grade (approximately 11 years of age). Participants were also asked “How often had your parents or other adult care-givers slapped, hit, or kicked you?” (range 0 = never to 5 = more than ten times) and “How often had one of your parents or adult care-givers touched you in a sexual way, forced you to touch him or her in a sexual way, or forced you to have sexual relations?” (each item ranges from 0 = never happened to 5 = more than ten times). The frequency of some of the outcomes was too small to characterize as occurring more than once, for example the frequency of sexual abuse occurring more than once was 1.5%, hence physical abuse was defined as endorsing one time or more to the first question and sexual abuse as endorsing one or more times to the second question. Participants were asked “How often had your parents or adult caregivers not taken care of your basic needs such as keeping you clean or providing food or clothing”, (range 0 = never to 5 = more than ten times). Child neglect was defined as occurring if participants reported this occurred at least once. Furthermore, participants were asked prior to them entering the 6th grade “How often had social services investigated how you were taken care of or tried to take you out of your living situation?”. Involvement with social services was defined as endorsing once or more times to this question.
Questionnaires ascertained information on socio-demographic factors, including age, sex, race/ethnicity and highest education level achieved. Highest education level was categorized as: less than high school, high school graduate, some college, college graduate or graduate education. Health behaviors were also assessed through questionnaire and were dichotomized into clinically meaningful categories. Current daily smoking in adulthood was defined as smoking at least one cigarette per day in the past 30 days. Physical activity was defined as 5 or more bouts of moderate to vigorous physical activity per week, based on self-report at the 4th wave of follow-up. Alcohol use was dichotomized as consuming two drinks or less, or consuming more than two drinks at one sitting for men and among women, as consuming one drink or less, or consuming more than one drink per sitting. Participants also completed the Center for Epidemiologic Studies Depression Scale (CESD) -10 scale to assess depressive symptomatology . High depression symptomatology was characterized as a score greater than 11 according to established guidelines . During the fourth wave of follow-up visits, the participant’s height and weight were assessed. Obesity was defined as BMI > =30.
Bivariate analyses examined the relation between child maltreatment and social services visits and hypertension among men and women. Given the high prevalence of hypertension in this sample, (28% men and 14% women) the use of odds ratios would be inappropriate , thus, binomial regression models were conducted to examine the relationship between child maltreatment and hypertension, adjusting for sociodemographic factors (age, race/ethnicity and highest education level attained), stratified by sex. Binomial regression models directly compute prevalence ratios (PR). The correlation between the types of maltreatment ranged from 0.12 to 0.30, thus they were jointly included in regression models. Thus, the PR for the association between each type of abuse and hypertension is adjusted for all other types. Three sets of models were conducted, both stratified by sex: 1) Adjusting for sociodemographic factors in model 1; 2) Further adjusting for the health behaviors of obesity, alcohol use, physical activity and smoking status at wave 4; and 2) Adjusting for covariates in models 1 and 2 and further adjusting for high depressive symptomatology. All analyses were weighted to account for the sampling method and conducted in SAS version 9.0 (SAS Institute, Cary, NC).
Table 1 shows the distribution of child maltreatment, socio-demographics, as well as study covariates. The sample comprises mostly of White (66%) men and women who were 29 years of age on average (SD 1.7, Range 25–34) at the time of the Wave 4 (2007–2008) assessment (Table 1). Twenty-eight percent of men had high blood pressure, as did 14% of women (Table 1). Cardiovascular risk factors were highly present in this sample, 36% of men and 38% of women were obese, and 27% of men and 22% of women were current smokers. Child maltreatment was also common, 14% of men and 8% of women reported ever experiencing neglect, 28% of men and 27% women reported experiencing physical maltreatment and 5% of both men and women reported experiencing sexual abuse as a child. In addition 4% of men and 5% of women reported their family being investigated by social services.The prevalence of hypertension by child maltreatment status and social services visitation is presented in Figure 1. Men who experienced neglect (31% vs. 28%), sexual abuse (30% vs. 28%) or whose families were investigated by social services (32% vs. 28%) had a higher prevalence of hypertension compared to those who did not endorse those experiences, however these were not statistically significant differences. Women who experienced sexual abuse had a non-statistically significant higher prevalence of hypertension (17% vs. 14%) compared to those who did not. In contrast those who experienced physical abuse (12% vs. 15%) or whose families were involved with social services (12% vs. 14%) had a lower prevalence of hypertension compared to those who did not endorse those experiences, however these differences were not statistically significant.
In models adjusted for socio-demographic factors, and other forms of maltreatment, women who experienced sexual abuse in early childhood had a significantly higher prevalence of hypertension (PR 1.43 95% CI 1.00, 2.05) compared to women who did not experience sexual abuse (Table 2). Among men, experiencing sexual abuse in early childhood was not associated with higher prevalence of hypertension (PR 0.98 95% CI 0.72, 1.32). Experiencing neglect, physical abuse or having visitations by social services at home during childhood was not associated with hypertension among either women or men. While the effect estimates did not substantially change upon inclusion of other covariates, their statistical significance did change. After adjustment for physical activity, current smoking, obesity, alcohol use and depressive symptomatology, women experiencing sexual abuse had a higher prevalence of hypertension (PR 1.35 95% CI 0.92, 1.96) albeit this was no longer statistically significant.
In this study we found evidence of an association between child sexual abuse and hypertension among women but noted no associations among other forms of maltreatment and hypertension or among any of the forms of child maltreatment examined and hypertension among men. A positive relation between child maltreatment and hypertension in adulthood has been previously demonstrated [6–9, 22]. For example, Riley and colleagues, using the Nurses Health Study II data, were able to characterize abuse that occurred prior to age 11 and later experiences of abuse noting that those who experience abuse in both childhood and adolescence, classified as more severe and frequent, had a higher risk of self-reported hypertension . Our results, using actual blood pressure data, validate and extend these prior results using self-reported data.
Sex differences in the association between maltreatment and hypertension have, to our knowledge, only been examined in one other study; an analysis using the National Comorbidity Survey showed that experiencing physical abuse during childhood is associated with self-reported hypertension among adult men but not women, and sexual abuse was associated with self-reported hypertension among women but not men . Prior studies have highlighted sex-specific responses in blood pressure to job strain [23–25] with negative consequences for men. In contrast we note no relation between physical abuse and hypertension among men or women but note a significant association between sexual abuse and hypertension among women. Differential coping mechanisms or differential HPA axis dysregulation in response to stress between men and women may account for the differences noted [14–17, 26].
To our knowledge, all studies examining child maltreatment and hypertension in adulthood, which have noted significant associations, have used self-reported hypertension [6, 7, 9, 22, 27]. In contrast we use measured blood pressure to define hypertension thus reducing the potential for self-report bias. A recent study of the relation between intimate partner violence and cardiovascular endpoints in the Nurses Health Study, noted stronger associations between non-verified cardiovascular outcomes and violence exposure compared to associations that relied on verified cardiovascular outcomes suggesting self-report bias .
The effects of chronic stressors, such as violence, on hypertension can be the result of modified health behaviors known to be affected by chronic stressors; smoking, drinking, and poor dietary habits have been shown to be more prevalent in stressful environments and have also been shown to be associated with cardiovascular disease, including hypertension. Adjusting for obesity, physical activity, smoking and alcohol consumption in our analyses did not change the effect estimates noted though the effect of sexual abuse on hypertension among women was no longer statistically significant. A more direct pathway through which stress can affect health is through its activation of the autonomic nervous system. Animal studies have demonstrated that hypertension following social stress is associated with increased norepinephrine turnover, with other mechanistic studies providing evidence for the role of inflammatory responses and renal mechanisms . Chronic stress has also been shown to induce a chronic and systemic state of mild inflammation (i.e., C-reactive protein and interleukin-6) a key mechanism in the development of cardiovascular disease .
There are a number of limitations worth mentioning. First, as is typical with longitudinal studies, there is a reduction in the sample available from the original Add Health cohort over time; it is likely the loss to follow-up is non-differential with respect to outcome, potentially biasing our results towards the null. However, we use longitudinal sampling weights, which adjust the sample to be representative of sample characteristics at baseline. Second, while the retrospective assessment of maltreatment was collected prior to our outcome assessment it consisted of only three questions that did not account for the severity of the exposures. Thus we were limited to a yes/no characterization of maltreatment exposure. A more detailed assessment that would query about different experiences of neglect, emotional, sexual and physical abuse separately would allow for better classification of severity of exposure. However, the fact that we were able to detect associations between these crude measures of maltreatment and hypertension suggest the dynamic is robust. Third, our assessment of blood pressure was conducted at only one point in time; multiple assessments of blood pressure would provide a more reliable measure of hypertension in this sample. However, we improve upon other studies that relied solely on self-reported hypertension. Finally, as noted in prior studies, the prevalence of hypertension in this national sample of young adults is higher than in other nationally representative samples [31, 32]. If the prevalence of hypertension is associated with inaccurate measurement then this would have likely led to underestimation of the association between maltreatment and hypertension in our analysis.
This study is one of the first analyses of the effects of child maltreatment on measured blood pressure, noting a significant relation between child sexual abuse and hypertension among women that may be partially attributed to health behaviors. Detection of child abuse early in the life course, coupled with appropriate psychological counseling and health behavior management may prevent the development of hypertension among women along with numerous adverse health conditions. Given the high prevalence of hypertension in this national sample of young adults [31, 32], a focus on the identification of risk factors early in the life course is warranted. Future studies that examine how child maltreatment impacts the trajectory of health behaviors and health outcomes across the life course can help identify mechanisms and modifiable factors that can be used in intervention and prevention efforts.
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The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2458/14/1149/prepub
Dr. Suglia was supported by Grant Number 7K01HL103199-03. Dr. Clark was supported by grant numbers 1R03HD068045-01A1 and KL2TR000113. Dr. Boynton-Jarrett was supported by the William T Grant Foundation and Grant Number K12HD43444. Dr. Kressin is supported in part by a Senior Research Career Scientist award from the Department of Veterans Affairs, Health Services Research & Development Service (RCS 02-066-1).
This research uses data from Add Health, a program project directed by Kathleen Mullan Harris and designed by J. Richard Udry, Peter S. Bearman, and Kathleen Mullan Harris at the University of North Carolina at Chapel Hill, and funded by grant P01-HD31921 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development, with cooperative funding from 23 other federal agencies and foundations. Special acknowledgment is due Ronald R. Rindfuss and Barbara Entwisle for assistance in the original design. Information on how to obtain the Add Health data files is available on the Add Health website (http://www.cpc.unc.edu/addhealth). No direct support was received from grant P01-HD31921 for this analysis.
The authors declare that they have no competing interests.
SFS conceptualized and designed the study, conducted the statistical analyses, drafted the initial manuscript, and approved the final manuscript as submitted. CJC contributed to the interpretation of data analysis, reviewed the manuscript, and approved the final manuscript as submitted. NK contributed to the interpretation of the analysis, reviewed the manuscript, and approved the final manuscript as submitted. RBJ contributed to the interpretation of analyses, reviewed the manuscript, and approved the final manuscript as submitted. KCK conceptualized the study, critically revised and reviewed the manuscript and approved the final manuscript as submitted.
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Suglia, S.F., Clark, C.J., Boynton-Jarrett, R. et al. Child maltreatment and hypertension in young adulthood. BMC Public Health 14, 1149 (2014). https://doi.org/10.1186/1471-2458-14-1149
- Child maltreatment
- Blood pressure