Cross-sectional and longitudinal associations between self-esteem and BMI depends on baseline BMI category in a population-based study

BACKGROUND

Some studies have reported associations between self-esteem and weight status, but longitudinal data on adults remain scarce. The aim of this population-based study was to analyze the cross-sectional and longitudinal association between self-esteem and body mass index (BMI) and to investigate whether baseline BMI has an impact on this association.

METHODS

In 2016, 29,735 participants aged ≥ 18 years in the NutriNet-Santé cohort completed the Rosenberg Self-Esteem Scale. BMI was self-reported yearly over a 4-year period. Association between self-esteem and BMI was assessed using mixed models and logistic regressions. Analyses were stratified by BMI (categorical) at baseline and adjusted on sociodemographic and lifestyle characteristics.

RESULTS

At baseline, higher self-esteem was associated with higher BMI in normal weight individuals(p = 0.32), and with lower BMI in obese class II and III individuals (p = 0.13). In addition, higher baseline self-esteem was associated with BMI increase over time in normal weight individuals (p = 0.15). Among normal weight individuals, those with higher self-esteem were less likely to show a decrease in their BMI (p = 0.005), while no association was observed with BMI increase (p = 0.81).

DISCUSSION

Our findings suggest that the association between self-esteem and BMI depends on the initial category of BMI, with a negligible effect of self-esteem.

Study protocol of the iMPaCT project: a longitudinal cohort study assessing psychological determinants, sexual behaviour and chlamydia (re)infections in heterosexual STI clinic visitors

Background

Chlamydia trachomatis (chlamydia), the most commonly reported sexually transmitted infection (STI) in the Netherlands, can lead to severe reproductive complications. Reasons for the sustained chlamydia prevalence in young individuals, even in countries with chlamydia screening programs, might be the asymptomatic nature of chlamydia infections, and high reinfection rates after treatment. When individuals are unaware of their infection, preventive behaviour or health-care seeking behaviour mostly depends on psychological determinants, such as risk perception. Furthermore, behaviour change after a diagnosis might be vital to reduce reinfection rates. This makes the incorporation of psychological determinants and behaviour change in mathematical models estimating the impact of interventions on chlamydia transmission especially important. Therefore, quantitative real-life data to inform these models is needed.

Methods

A longitudinal cohort study will be conducted to explore the link between psychological and behavioural determinants and chlamydia (re)infection among heterosexual STI clinic visitors aged 18–24 years. Participants will be recruited at the STI clinics of the public health services of Amsterdam, Hollands Noorden, Kennemerland, and Twente. Participants are enrolled for a year, and questionnaires are administrated at four time points: baseline (before an STI consultation), three-week, six-month and at one-year follow-up. To be able to link psychological and behavioural determinants to (re)infections, participants will be tested for chlamydia at enrolment and at six-month follow-up. Data from the longitudinal cohort study will be used to develop mathematical models for curable STI incorporating these determinants to be able to better estimate the impact of interventions.

Discussion

This study will provide insights into the link between psychological and behavioural determinants, including short-term and long-term changes after diagnosis, and chlamydia (re)infections. Our mathematical model, informed by data from the longitudinal cohort study, will be able to estimate the impact of interventions on chlamydia prevalence, and identify and prioritise successful interventions for the future. These interventions could be implemented at STI clinics tailored to psychological and behavioural characteristics of individuals.

Trial registration

Dutch Trial Register NTR-6307. Retrospectively registered 11-nov-2016.

Perceived Postoperative Support Differentiates Responders from Non-Responders 3 Years After Laparoscopic Roux-en-Y Gastric Bypass

BACKGROUND

Bariatric surgery is an effective intervention for the majority of patients with morbid obesity, but a significant minority fails to achieve substantial weight loss. In the search of possible predictors of weight loss following bariatric surgery, preoperative factors turn out to have limited predictive power. This study will examine the impact of two postoperative factors on weight loss: perceived social support and stressful life events.

METHODS

From the entire 2013 cohort that underwent laparoscopic Roux-and-Y gastric bypass (LRYGB) in a general hospital in the Netherlands, a group of 56 non-responders and a matched group of 56 responders were selected, using an alterable weight loss (%AWL)-based percentile chart. Patients from both groups were interviewed by phone to collect data on demographics, medical complications and comorbidities, social support and stressful life events. A total of 61 patients completed the data collection (54% response rate).

RESULTS

One-way ANOVA analysis showed that responders and non-responders differed with regard to perceived support (F(1) = 8.60, p = .005). In a model with place of birth, level of education and pre-surgery diabetes mellitus as covariates, perceived social support was able to classify 83.6% of patients correctly as either responder or non-responder (χ ² = 28.26, p < .001). Stressful life events turned out to be unrelated to weight loss.

CONCLUSIONS

Perceived social support differentiates responders from non-responders after LRYGB. When patients present themselves after LRYGB with sub-optimal weight loss, social support should be a focus of attention.

Psychological Determinants of Medication Adherence in Stroke Survivors: a Systematic Review of Observational Studies

BACKGROUND

Medications targeting stroke risk factors have shown good efficacy, yet adherence is suboptimal. To improve adherence, its determinants must be understood. To date, no systematic review has mapped identified determinants into the Theoretical Domains Framework (TDF) in order to establish a more complete understanding of medication adherence.

PURPOSE

The aim of this study was to identify psychological determinants that most influence stroke survivors' medication adherence.

METHODS

In line with the prospectively registered protocol (PROSPERO CRD42015016222), five electronic databases were searched (1953-2015). Hand searches of included full text references were undertaken. Two reviewers conducted screening, data extraction and quality assessment. Determinants were mapped into the TDF.

RESULTS

Of 32,825 articles, 12 fulfilled selection criteria (N = 43,984 stroke survivors). Tested determinants mapped into 8/14 TDF domains. Studies were too heterogeneous for meta-analysis. Three TDF domains appeared most influential. Negative emotions ('Emotions' domain) such as anxiety and concerns about medications ('Beliefs about Consequences' domain) were associated with reduced adherence. Increased adherence was associated with better knowledge of medications ('Knowledge' domain) and stronger beliefs about medication necessity ('Beliefs about Consequences' domain). Study quality varied, often lacking information on sample size calculations.

CONCLUSIONS

This review provides foundations for evidence-based intervention design by establishing psychological determinants most influential in stroke survivors' medication adherence. Six TDF domains do not appear to have been tested, possibly representing gaps in research design. Future research should standardise and clearly report determinant and medication adherence measurement to facilitate meta-analysis. The range of determinants explored should be broadened to enable more complete understanding of stroke survivors' medication adherence.