Genetic Variations in Elements of the Oxytocinergic Pathway are Associated with Attention/Hyperactivity Problems and Anxiety Problems in Childhood.

Genetic alterations related to oxytocin system seem to influence the neurobiology of attention-deficit hyperactivity disorder and anxiety problems leading to greater functional, social and emotional impairment. Here, we analyzed the association of OXTR rs2254298 and CD38 rs6449182 variants with attention/hyperactivity problems and anxiety problems in children. The study enrolled 292 children and adjusted regression model revealed OXTR rs2254298 AA genotype as a risk factor for attention deficit/hyperactivity problems (PR: 2.37; PadjFDR = 0.006), attention problems (PR: 2.71; PadjFDR = 0.003) and anxiety problems (PR: 1.92; PadjFDR = 0.018). CD38 rs6449182 G allele showed as a risk factor for attention deficit/hyperactivity problems (PR: 1.56; PadjFDR = 0.028). Moreover, in silico approach for regulatory roles found markers that influence chromatin accessibility and transcription capacity. Together, these data provide genetic information of oxytocin in developmental and behavioral disorders opening a range of opportunities for future studies that clarify their neurobiology in childhood.

Children's eating behaviour traits and dental caries.

OBJECTIVES: This cross-sectional study aimed to assess eating behavior traits in children with or without dental caries. METHODS: A sample of 580 children aged 8 years enrolled in 20 public schools in the city of Pelotas, Brazil were included. Parents/caregivers provided sociodemographic information and answered the Children's Eating Behavior Questionnaire (CEBQ) to assess eating behavior traits. This instrument possesses the subscales: food responsiveness, enjoyment of food, satiety responsiveness, slowness in eating, food fussiness, emotional overeating, emotional undereating, and desire to drink. To assess the presence of decayed, missing or filled teeth (DMFT/dmft), the World Health Organization (WHO) criteria were adopted. WHO criteria were used to evaluate presence of overweight and obesity. Analysis of variance (ANOVA) was used to compare the mean score in each CEBQ subscale according to the different exposure variables. Linear regression was used to assess the association between dental caries and CEBQ subscales means. RESULTS: Approximately half of the children were male (51.03 percent) and 66.73 percent had low/middle socioeconomic status. The mean DMFT/dmft was 2.41, ranging from 0 to 13, and 63 percent of the children showed DMFT/dmft > 0. After adjustments for potential confounders, children with dental caries showed higher scores on the subscales desire to drink (P = 0.03), and satiety responsiveness (P = 0.04). CONCLUSION: The present study showed that some aspects of eating behaviors differ in children with or without caries. Such knowledge adds to the understanding of the multifactorial etiology of caries and may help in the development of nutritional interventions to promote healthy eating behaviors, with benefits for oral health.

Generalized Anxiety Disorder, Depressive Symptoms and the Occurrence of Stressors Events in a Probabilistic Sample of Pregnant Women.

The aim of the study is to verify the association between GAD, the severity of depressive symptoms and stressors in pregnant women between the first and second trimester. Cross-sectional study, part of a cohort that followed 980 women during the gestational period of a city in southern Brazil. We performed bivariate analysis using the t-test and chi-square. The variables that presented p ≤ 0.20 were taken for multivariate analysis, through logistic regression, in order to control possible confounding factors. The Mini International Neuropsychiatric Interview Plus was used to evaluate GAD, the severity of depressive symptoms was investigated through the Beck Inventory of Depression II, and stress events according to the Social Readjustment Assessment Scale of Holmes e Rahe. The sample consisted of 980 women. Women with mild depression symptoms had 9.8 (IC95% 4.6;21.0) times more GAD, those with moderate symptoms had 27.5 (IC95% 12.5;60.0) times more GAD, and those with severe symptoms had 52.9 (IC95% 19.1;146.5) times more GAD when compared to pregnant women with no symptoms or minimal symptoms. Regarding the stressful events, the pregnant women who presented GAD had an increase of 1.0 (IC95% 1.0;1.1) point in the mean of occurrence of stressor events when compared to those without GAD. These findings highlight the need for prevention strategies and interventions to promote maternal mental health, which benefit the development of infants in the long term.

How sex differences in schooling and income contribute to sex differences in depression, anxiety and common mental disorders: The mental health sex-gap in a birth cohort from Brazil.

BACKGROUND: Reasons for the higher rates of depression, anxiety and common mental disorders among women are unclear. We investigated the mediating effect of schooling and personal income and the effect modification of maternal schooling and family income at baseline. METHODS: In 1982, the maternity hospitals of Pelotas (Southern Brazil) were daily visits and those livebirths whose family lived in the urban area of the city were examined and their mothers interviewed. At 30 years, the presence of major depression (MD) and generalized anxiety disorder (GAD) was assessed using the Mini-International Psychiatric Interview, and common mental disorders (CMD) with the self-rated questionnaire. We used Mantel-Haenszel test to assess effect modification and a counterfactual framework using inverse probability weights (IPW) and G-computation to analyze mediation. RESULTS: Income at 30 years captured part of the association of sex with MD (16.5%), GAD (14.2%), and CMD (18.0%). Schooling at 30 years was higher in women (p<0.001), and therefore inversely mediated the association with MD (-5.4%), GAD (-4.8%), and CMD (-6.7%). If we fixed the mediator to earning more than 3 minimum salaries, the effect of sex, was reduced in 64.9%, 56.7% and 31.4%, for MD, GAD and CMD, respectively, and 62.4%, 13.6% and 23.8%, if fixed to 12 or more years of schooling. LIMITATIONS: We were not able to evaluate mental health and socioeconomic changes, or assess a bidirectional effect CONCLUSION: Personal income and schooling at 30 years, are important mediators and effect modifiers of the association between sex and MD, GAD, and CMD.

Overweight trajectory and cardio metabolic risk factors in young adults.

BACKGROUND: Obesity is one of the conditions that increases the risk of cardiovascular disease. Studies about obesity trajectory and cardio metabolic outcomes at adulthood are still scarce. Therefore, we aimed to assess the association between patterns of overweight over the life-course and cardio metabolic risk factors in young adults. METHODS: In 1982, the maternity hospitals in Pelotas were visited daily and those newborns whose family lived in the urban area of the city were identified (n = 5914), and have prospectively followed for several occasions. Weight and height were measured at every visit. BMI-for-age z-score was calculated using the WHO Child Growth Standards. Overweight and obesity were defined as a BMI greater than or equal to 25 kg/m2 and 30 kg/m2 respectively. This was the definition adopted for evaluations overweight and obesity at 30 years. The participants were divided into eight groups according to the presence of overweight or obesity in childhood, adolescence and adulthood. Blood pressure, random blood glucose, HDL cholesterol, LDL cholesterol triglycerides and fat mass were measured. RESULTS: From 2219 participants with anthropometric data in childhood, adolescence and adulthood, 25% never had been overweight, whereas 11.6% were overweight in the three periods. Random blood glucose, SBP and DBP were higher among those subjects who were always overweight/ obese or only overweight/obese during adolescence and adulthood. The participants who were never overweight/obese or only in childhood or adolescence had a lower cardiovascular risk profile (higher HDL cholesterol, lower blood pressure, lower random glucose, lower LDL cholesterol) at 30 years. Fat mass captured from 25 to 100% of the association of overweight and obesity trajectory with cardiometabolic risk factors. CONCLUSIONS: The tracking of overweight/obesity is associated with an adverse cardio metabolic profile and this association is largely mediated by fat mass in adulthood.

Breastfeeding and mental health in adulthood: A birth cohort study in Brazil.

BACKGROUND: Breastfeeding is negatively associate with behavioral and internalization problems, psychological stress, and depressive/anxiety symptoms. However, studies evaluating specific mental health disorders are scarce. We aimed to assess the association between breastfeeding and mental health outcomes in young adults. METHODS: In 1982, hospital deliveries in Pelotas (Southern Brazil) were identified; liveborns were examined and their mothers interviewed (n=5914). Information on breastfeeding was collected in early childhood. In 2012-13, at 30 years of age, we used the Mini International Neuropsychiatric Interview (MINI) for the diagnosis of major depression (MD), generalized anxiety disorder (GAD) and social anxiety disorder (SAD). In addition, we used the Beck Depression Inventory (BDI-II) and the Self-reported Questionnaire (SRQ-20), to evaluate depressive symptoms severity and common mental disorders (CMD), respectively. We used multivariable regression models to evaluate the association between breastfeeding and mental health outcomes. RESULTS: We evaluated 3657 individuals. Prevalence of CMD, MD, GAD and SAD was 24.3%, 7.9%, 12.7% and 3.6%, respectively. In multivariable models the odds of having a more severe case of depression (BDI-II) was smaller among those breastfed for 6 or more months (OR=0.69 95%CI [0.53-0.89]). We observed a similar pattern for MD and CMD, however, confidence intervals included the reference. LIMITATIONS: We had no information on home environment characteristics during childhood. Lack of power and a small effect size could explain why we did not detect an association between breastfeeding and MD. CONCLUSION: Breastfeeding reduced the odds of having more severe depressive symptoms.