On the Coupling Time of the Heat-Bath Process for the Fortuin–Kasteleyn Random–Cluster Model

We consider the coupling from the past implementation of the random-cluster heat-bath process, and study its random running time, or coupling time. We focus on hypercubic lattices embedded on tori, in dimensions one to three, with cluster fugacity at least one. We make a number of conjectures regarding the asymptotic behaviour of the coupling time, motivated by rigorous results in one dimension and Monte Carlo simulations in dimensions two and three. Amongst our findings, we observe that, for generic parameter values, the distribution of the appropriately standardized coupling time converges to a Gumbel distribution, and that the standard deviation of the coupling time is asymptotic to an explicit universal constant multiple of the relaxation time. Perhaps surprisingly, we observe these results to hold both off criticality, where the coupling time closely mimics the coupon collector's problem, and also at the critical point, provided the cluster fugacity is below the value at which the transition becomes discontinuous. Finally, we consider analogous questions for the single-spin Ising heat-bath process

Prevalência do HIV no Brasil 2005-2015: dados do Sistema Único de Saúde

Introdução: O HIV, tornou-se um dos maiores problemas da saúde pública no mundo. O Brasil tem apresentado avanços em relação ao tratamento, porém teve alguns retrocessos. O objetivo do estudo foi descrever a prevalência do HIV no Brasil no período de 2005-2015. Materiais e Métodos: Estudo transversal com dados secundários do Sistema Único de Saúde (DATASUS) sobre notificações de HIV. A análise estatística se deu por meio do teste de qui-quadrado para comparar a frequência do número de casos de acordo com as variáveis de notificação de casos e obtenção das taxas de HIV. Resultados: O Brasil apresentou entre os anos de 2005-2015 aumento nas taxas de notificações de HIV, passando de 11 casos em para 18 casos/100 mil habitantes. A região sul apresentou aumento de 16,6 para 28,9 casos/100 mil habitantes. Homens possuem as taxas mais altas de notificações, sendo a faixa etária mais prevalente a dos 30-49 anos. A Cor/Raça branca teve o maior percentual médio (46,9%) de pessoas com notificação entre os anos de 2005-2012. Pessoas com menores níveis educacionais tiveram queda nas taxas de notificações entre 2005-2015, passando de 45,4%-27,9%. Discussão: No Brasil, observa-se no período avaliado o aumento nas taxas de prevalência de HIV, com predomínio de novos casos na faixa etária dos 30 aos 49 anos e do sexo masculino. Conclusões: São necessárias medidas de prevenção e educação em saúde desta população mais exposta ao risco sejam realizadas no país com maior frequência, principalmente nas regiões que se tem maior número de registros do país.Como citar este artigo: Dartora WJ, Ânflor ÉP, Silveira LRP. Prevalência do HIV no Brasil 2005-2015: dados do Sistema Único de Saúde. Rev Cuid. 2017; 8(3): 1919-28. http://dx.doi.org/10.15649/cuidarte.v8i3.46

Fatores de risco comportamentais modificáveis para DNT e sono em adolescentes brasileiros

OBJETIVO: Analisar a associação entre fatores de risco comportamentais modificáveis para doenças não transmissíveis e parâmetros do sono em adolescentes brasileiros. MÉTODOS: Estudo transversal que utilizou dados do Consórcio de Coortes RPS, São Luís, Brasil para o seguimento de adolescentes de 18-19 anos (n = 2.515). Os desfechos foram a sonolência diurna excessiva (Escala de Sonolência de Epworth – ESE) e a qualidade do sono (Índice de Qualidade do Sono de Pittsburgh – IQSP). As exposições de interesse foram os fatores de risco comportamentais para doenças não transmissíveis (DNT): tempo de tela, inatividade física, álcool, cigarro, drogas ilícitas, consumo de cafeína, consumo de bebidas adoçadas com açúcar. O excesso de peso foi considerado um possível mediador dessa associação entre as exposições de interesse e os desfechos. Os modelos foram analisados por modelagem com equações estruturais. RESULTADOS: A inatividade física (Coeficiente padronizado, CP = 0,112; p = 0,001), maior consumo de álcool (CP = 0,168; p = 0,019) e de bebidas adoçadas com açúcar (CP = 0,128; p < 0,001) foram associados a sonolência diurna excessiva nos adolescentes; a melhor situação socioeconômica também foi associada a este desfecho (CP = 0,128; p < 0,001). A inatividade física (CP = 0,147; p < 0,001) e o maior consumo de bebidas adoçadas com açúcar (CP = 0,089; p = 0,003) também se associaram com a qualidade do sono ruim. O excesso de peso não foi mediador e nem associado à qualidade do sono ou à sonolência diurna excessiva. CONCLUSÕES: Os principais fatores de risco comportamentais modificáveis para DNT estão associados a piores parâmetros do sono já na adolescência; alertando para um quadro de acúmulos de riscos para distúrbios de sono no futuro.OBJECTIVE: To analyze the association between modifiable behavioral risk factors for non-communicable diseases and sleep parameters in Brazilian adolescents. METHODS: This was a cross-sectional study that used data from the RPS Cohort Consortium, São Luís, Brazil for the follow-up of adolescents aged 18–19 years (n = 2,515). The outcomes were excessive daytime sleepiness (Epworth Sleepiness Scale – ESS) and sleep quality (Pittsburgh Sleep Quality Index – PSQI). The exposures of interest were the behavioral risk factors for non-communicable diseases (NCDs): screen time, physical inactivity, alcohol, smoking, illicit drugs, caffeine intake, and consumption of sugar-sweetened beverages. Excess weight was considered a possible mediator of this association between the exposures of interest and the outcomes. The models were analyzed by modeling with structural equations. RESULTS: Physical inactivity (standardized coefficient, SC = 0.112; p = 0.001), higher consumption of alcohol (SC = 0.168; p = 0.019) and of sugar-sweetened beverages (SC = 0.128; p < 0.001) were associated with excessive daytime sleepiness in adolescents; better socioeconomic status was also associated with this outcome (SC = 0.128; p < 0.001). Physical inactivity (SC = 0.147; p < 0.001) and higher consumption of sugar-sweetened beverages (SC = 0.089; p = 0.003) were also associated with poor sleep quality. Overweight was neither a mediator nor associated with sleep quality or excessive daytime sleepiness. CONCLUSIONS: T he m ain m odifiable b ehavioral r isk f actors f or N CDs a re a ssociated with worse sleep parameters already in adolescence, which serves as a warning toward the accumulation of risks for sleep disorders in the future

Prepregnancy body mass index, gestational weight gain, and birth weight in the BRISA cohort

OBJECTIVE: To analyze the effects of maternal pre-pregnancy body mass index and weight gain during pregnancy on the baby’s birth weight. METHODS: We conducted a cross-sectional study with 5,024 mothers and their newborns using a Brazilian birth cohort study. In the proposed model, estimated by structural equation modeling, we tested socioeconomic status, age, marital status, pre-pregnancy body mass index, smoking habit and alcohol consumption during pregnancy, hypertension and gestational diabetes, gestational weight gain, and type of delivery as determinants of the baby’s birth weight. RESULTS: For a gain of 4 kg/m2 (1 Standard Deviation [SD]) in pre-pregnancy body mass index, there was a 0.126 SD increase in birth weight, corresponding to 68 grams (p < 0.001). A 6 kg increase (1 SD) in gestational weight gain represented a 0.280 SD increase in newborn weight, correponding to 151.2 grams (p < 0.001). The positive effect of pre-pregnancy body mass index on birth weight was direct (standardized coefficient [SC] = 0.202; p < 0.001), but the negative indirect effect was small (SC = -0.076, p < 0.001) and partially mediated by the lower weight gain during pregnancy (SC = -0.070, p < 0.001). The positive effect of weight gain during pregnany on birth weight was predominantly direct (SC = 0.269, p < 0.001), with a small indirect effect of cesarean delivery (SC = 0.011; p < 0.001). Women with a higher pre-pregnancy body mass index gained less weight during pregnancy (p < 0.001). CONCLUSIONS: The effect of gestational weight gain on the increase in birth weight was greater than that of pre-pregnancy body mass index

Leprosy in children under 15 years of age in a municipality in northeastern Brazil : evolutionary aspects from 2003 to 2015

INTRODUCTION: The Integrated Program of Leprosy Control was initiated in 2003 in the municipality of Buriticupu, Maranhão, Brazil, an area considered hyperendemic for leprosy. Here, we present the evolution of the indicators of leprosy within the established period in children aged <15 years. METHODS: This is a descriptive study based on an active search for cases and spontaneous healthcare demand for leprosy, with an evolutionary analysis of the detection coefficient of new cases. We considered individuals aged <15 years diagnosed with leprosy from January 2003 to December 2015. To evaluate the factors associated with clinical and operational forms, Chi-square, Fisher’s exact, or Fisher-Freeman-Halton tests were performed. RESULTS: A total of 61 new cases were detected (6.9% of the total leprosy cases diagnosed in the municipality during the study period), and the majority was found in males (62.3%). The most frequent operational classification was paucibacillary (67.2%), and this association increased with age. The tuberculoid clinical form was the most prevalent in both sexes and in the age range of 10 to <15 years. There was a reduction in the detection coefficient from 21.84/100,000 inhabitants in 2003 to 2.79/100,000 in 2015. CONCLUSIONS: Despite the progress in the control of leprosy, this historical series shows that it is necessary to strengthen educational measures and implement control actions, so that the disease ceases to be a public health problem in the population aged <15 years

Teamwork in nursing: restricted to nursing professionals or an interprofessional collaboration?

Abstract OBJECTIVE To understand the nursing professionals' conceptions of teamwork and their elements. METHOD A qualitative study conducted in an oncological hospital using a semi-structured interview with 21 nursing professionals. RESULTS Two conceptions emerged from the accounts: teamwork restricted to nursing professionals and teamwork with interprofessional collaboration with particular importance for interactive dimensions: communication, trust and professional bonds, mutual respect and recognition of the other's work, collaboration, and conflict, with this last subcategory considered as an obstacle to teamwork. CONCLUSION Nursing conceives teamwork as an interprofessional practice, which is a result of the quality of interaction among professionals from different areas and involves the recognition and handling of conflicts