The use of sunscreen is a key component of public health campaigns for skin cancer prevention, but epidemiological studies have raised doubts on its effectiveness in the general population. This systematic review and meta-analysis aimed to assess the association between risk of skin cancer and sunscreen use. We searched PubMed, BIREME and Google Scholar from inception to May 17, 2017, to identify observational studies and controlled trials. We used a random-effects model for conventional and cumulative meta-analyses. We included 29 studies (25 case-control, two cohort, one cross-sectional, and one controlled trial) involving 313,717 participants (10,670 cases). The overall meta-analysis did not show a significant association between skin cancer and sunscreen use (odds ratio (OR) = 1.08; 95% CI: 0.91-1.28, I² = 89.4%). Neither melanoma (25 studies; 9,813 cases) nor non-melanoma skin cancer (five studies; 857 cases) were associated with sunscreen use, with a pooled OR (95% CI) of 1.10 (0.92-1.33) and 0.99 (0.62-1.57), respectively. The cumulative evidence before the 1980s showed a relatively strong positive association between melanoma and sunscreen use (cumulative OR: 2.35; 95% CI: 1.66-3.33). The strength of the association between risk of skin cancer and sunscreen use has constantly decreased since the early 1980s, and the association was no longer statistically significant from the early 1990s. While the current evidence suggests no increased risk of skin cancer related to sunscreen use, this systematic review does not confirm the expected protective benefits of sunscreen against skin cancer in the general population.

Resumo O manejo inadequado da diabetes mellitus (DM) pode levar a complicações que afetam a qualidade de vida. A prevalência da DM e suas complicações está aumentando, apresentando distribuição desigual na população. O objetivo foi estimar a prevalência de complicações devido à DM e avaliar as desigualdades na população brasileira. Estudo transversal, com dados da Pesquisa Nacional de Saúde (PNS), de 2019. As complicações avaliadas foram: coma diabético, infarto/Acidente Vascular Cerebral/derrame, problema nos rins, problema na visão e úlcera nos pés ou amputação. As exposições foram a escolaridade e renda. Foram calculadas as prevalências das complicações separadamente, combinação em duplas, presença de alguma complicação e número de complicações. A desigualdade foi estimada por meio de análise ajustada e dos índices: slope index (SII) e o concentration index (CIX). A amostra foi composta por 6.317 pessoas com DM. Mais de um terço (37,8%) referiu ter alguma complicação. O problema na visão (30,6%) e nos rins (9,7%) foram os mais prevalentes. As prevalências de ter “uma” e “duas ou mais” complicações foram 25,4% e 12,4%. Foram evidenciadas desigualdades com maior prevalência de complicações entre os menos escolarizados e mais pobres.

Objective: To assess the prevalence of excessive use of social media and associated factors, as well as possible health consequences in high school students in southern Brazil. Methods: This is a population-based cross-sectional study, conducted with high school students in the city of Rio Grande, RS. All students who were attending high school at the Federal Institute of Rio Grande do Sul, campus Rio Grande, were eligible for this research in the second semester of 2019. In total, 513 students participated in the study. The dependent variable was excessive use of social media, defined as more than five hours per day. Descriptive and bivariate analyses were carried out and the Poisson regression was used to verify associations, with robust adjustment of variance. Results: The prevalence of students who reported excessive use of social media was 35.9%. The groups that were most susceptible to excessive use of social media had the following profile: female, black/brown skin, aged between 18 and 20 years old, attending the first year of high school. Excessive use of social media was shown to be associated with smoking, risk of depression, anxiety and stress, high risk of suicide and drug use. Conclusions: More than a third of students used social media excessively. This behavior was associated with negative health outcomes.

One of the main prevention methods against skin cancer is the use of sunscreen; however, incidence of this disease has not declined despite prevention campaigns. Investigate the prevalence of non-use of sunscreen and its associated factors. A population-based cross-sectional study with individuals aged 18 years or over living in the urban area. Conducted between April and July of 2016. Participants were interviewed about socioeconomic, demographic, and behavioral questions. Non-use of sunscreen was considered as the outcome. For multivariate analysis, Poisson regression with robust adjustment for variance was used. Among the 1300 participants, prevalence of non-use of sunscreen was 38.2% (95% CI: 34.6-41.8). The variables independently associated with the outcome were male sex, older age, brown or black skin color, lower income, fewer years of education, no physical activity in leisure time, no medical consultations in the last year, and self-perception of health as regular or poor. The prevalence may be underestimated by reports of more use of sunscreen than actually used, which could increase the figure in the outcome. It was estimated that about four out of ten adults and elderly do not use sunscreen in this sample. Prevention strategies are needed to advance health policy and ensure that sun protection options are easily accessible.

Resumo Objetivo: Avaliar a prevalência do uso excessivo de redes sociais e identificar os seus fatores associados em estudantes do ensino médio do Sul do Brasil. Métodos: Trata-se de um estudo transversal de base populacional. Foram elegíveis para esta pesquisa todos os estudantes que estavam cursando o ensino médio no Instituto Federal do Rio Grande do Sul, campus Rio Grande, no 2º semestre de 2019. No total, 513 alunos participaram do estudo. A variável dependente deste estudo foi o uso excessivo de redes sociais, definido como mais de cinco horas por dia. Foram realizadas análises descritivas e bivariadas e, para verificar as associações, foi utilizada a regressão de Poisson, com ajuste robusto da variância. Resultados: A prevalência de estudantes que relataram uso excessivo de redes sociais foi de 35,9%. Os grupos mais suscetíveis a usar excessivamente as redes sociais foram: sexo feminino, cor de pele preta/parda e faixa etária entre 18 e 20 anos. Houve associação entre uso excessivo de redes sociais com tabagismo, risco de depressão, ansiedade e estresse, risco elevado de suicídio e uso de drogas. Conclusões: Mais de um terço dos estudantes usava em excesso as redes sociais. Esse comportamento esteve associado com desfechos negativos em saúde.

Key words Alcohol drinking; Pregnancy; Prevalence; Risk factors