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Adiposity, depression and anxiety: interrelationship and possible mediators
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Gomes, Ana Paula

; Soares, Ana Luiza G.

; Menezes, Ana M.B.

; Assunção, Maria Cecília

; Wehrmeister, Fernando C.

; Howe, Laura D.

; Gonçalves, Helen

Revista de Saúde Pública

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2019, Volume 53 elocation 103

Abstract: En | Text: En | PDF: En

ABSTRACT OBJECTIVES To explore the association between adiposity, major depressive disorder and generalized anxiety disorder, and to assess the role of inflammation, diet quality and physical activity in this association. METHODS We used data from 2,977 individuals from the 1993 Pelotas Cohort (Brazil) who attended the 18- and 22-year follow-ups. We assessed general obesity using body mass index, fat mass index, and abdominal obesity using waist circumference. Major Depressive Disorder and generalized anxiety disorder were assessed using the mini-international neuropsychiatric interview. C-reactive protein and interleukin-6 (IL-6) levels were used as a measure of inflammation; diet quality was estimated using the revised diet quality index, and physical activity was assessed by the International physical activity questionnaire (IPAQ, min/day). The association between adiposity and major depressive disorder and generalized anxiety disorder was assessed using logistic regression, and the natural indirect effect via the mediators was estimated using G-computation. RESULTS General obesity assessed by body mass index (OR: 2.3; 95% CI:1.13; 4.85), fat mass index (OR: 2.6; 95%CI: 1.37; 4.83), and abdominal obesity (OR: 2.5; 95%CI: 1.18; 5.39) were associated with higher odds of major depressive disorder, whereas major depressive disorder was only associated with obesity assessed by body mass index (OR=1.9; 95% CI: 1.09; 3.46). Obesity and generalized anxiety disorder were not associated. C-reactive protein, diet quality and physical activity did not mediate the effect of obesity on major depressive disorder, and C-reactive protein mediated about 25% of the effect of major depressive disorder on adiposity. CONCLUSIONS Depression, but not generalized anxiety disorder, is associated with adiposity in both directions, with a stronger evidence for the direction obesity-depression. Inflammation explains part of the effect of major depressive disorder on obesity but not the other way around. Further research should explore other mechanisms that could be involved in the association between obesity and depression.

https://doi.org/10.11606/s1518-8787.2019053001119 716 downloads

Adiposity, depression and anxiety: interrelationship and possible mediators
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Gomes, Ana Paula

; Soares, Ana Luiza G.

; Menezes, Ana M.B.

; Assunção, Maria Cecília

; Wehrmeister, Fernando C.

; Howe, Laura D.

; Gonçalves, Helen

Revista de Saúde Pública

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2019, Volume 53 elocation 103

Abstract: En | Text: En | PDF: En

https://doi.org/10.11606/s1518-8787.2019053001119

Biomass smoke COPD has less tomographic abnormalities but worse hypoxemia compared with tobacco COPD
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Meneghini, A.C.

; Koenigkam-Santos, M.

; Pereira, M.C.

; Tonidandel, P.R.

; Terra-Filho, J.

; Cunha, F.Q.

; Menezes, M.B. de

; Vianna, E.O.

Brazilian Journal of Medical and Biological Research

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2019, Volume 52 N. 5 elocation e8233

Abstract: En | Text: En | PDF: En

Special attention has emerged towards biomass smoke-induced chronic obstructive pulmonary disease (COPD), providing new knowledge for prevention and therapeutic approach of non-smoker COPD patients. However, the understanding of biomass smoke COPD is still limited and somewhat controversial. The aim of the present study was to compare COPD exclusively caused by tobacco smoking with COPD exclusively caused by environmental or occupational exposures. For this cross-sectional study, COPD patients were recruited from outpatient clinics and formed two groups: non-smoker COPD group (n=16) with exposure to biomass smoke who did not smoke cigarette and tobacco smoker COPD group (n=15) with people who did not report biomass smoke exposure. Subjects underwent pulmonary function tests, thoracic high-resolution computed tomography, 6-min walk test, and sputum induction. The non-smoker COPD group had biomass smoke exposure of 133.3±86 hour-years. The tobacco COPD group smoked 48.5±27.4 pack-years. Women were 62.5 and 66.7%, respectively, of non-smokers and smokers. The non-smoker COPD group showed higher prevalence of dyspnea, lower arterial oxygen tension (PaO2), and lower arterial oxygen saturation (SaO2%) with similar spirometry results, lung volumes, and diffusion capacity. Regarding inflammatory biomarkers, differences were detected in sputum number of lymphomononuclear cells and in sputum concentrations of interleukin (IL)-6 and IL-8 with higher values in the smoker group. Emphysema was more prevalent in the tobacco smoker group, which also showed higher relative bronchial wall thickness and lower lung density by quantitative analysis. Biomass smoke induced more hypoxemia compared to tobacco in COPD patients with similar severity.

https://doi.org/10.1590/1414-431x20198233 1111 downloads

Cat ownership is associated with increased asthma prevalence and dog ownership with decreased spirometry values
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Simoneti, C.S.

; Ferraz, E.

; Menezes, M.B.

; Icuma, T.R.

; Vianna, E.O.

Brazilian Journal of Medical and Biological Research

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2018, Volume 51 N. 12 elocation e7558

Abstract: En | Text: En | PDF: En

The association between pet ownership and the development of allergic and respiratory diseases has been the aim of several studies, however, the effects of exposure in adults remain uncertain. The aims of the present study were to investigate the prevalence of asthma and lung function status among dog and cat owners. This cross-sectional study was performed at two universities with students and workers who were allocated into 3 groups according to pet ownership in the previous year: cat owners, dog owners, and no pets (control group). Subjects underwent spirometry, bronchial challenge test with mannitol, skin prick tests, and questionnaires about animal exposures and respiratory symptoms. Control group comprised 125 subjects; cat owner group, 51 subjects; and dog owner group, 140 subjects. Cat owners had increased asthma prevalence (defined by symptoms and positive bronchial challenge test), but no changes in lung function compared to the control group. The dog owner group had lower spirometry values (forced expiratory volume in one second and lower forced vital capacity), but similar asthma prevalence, compared to the control group. In the cat owner group, excess of asthma may have an immunological basis, since we found an association with atopy. Although we did not have endotoxin data from volunteers' households, we postulated that low values of lung function were associated to exposure to endotoxins present in environments exposed to dogs.

https://doi.org/10.1590/1414-431x20187558 1385 downloads

Evaluation of carcass and muscle traits in Santa Ines female lambs finished with different agricultural products
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Menezes, A.M.

; Cruz Junior, C.A.

; Tanure, C.B.

; Peripolli, V.

; Castro, M.B.

; Louvandini, H.

; McManus, C.

Arquivo Brasileiro de Medicina Veterinária e Zootecnia

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oct 2016, Volume 68 N. 5 Pages 1259 - 1266

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO O objetivo deste estudo foi avaliar o efeito de diferentes produtos agrícolas sobre aspectos quantitativos da carcaça, constituintes do corpo, perda por cocção, força de cisalhamento e colorimetria dos músculos Longíssimus lumborum e Tríceps brachii em cordeiras Santa Inês. Vinte e quatro cordeiras Santa Inês receberam uma das quatro dietas, que foram isoproteicas e isoenergéticas, com níveis fixos de forragem (60%) e concentrado (40%) composto por milho e farelo de soja, durante 45 dias. As forragens diferiram entre as dietas: feno de coast cross (FENO), feno da parte aérea da mandioca (MAN), subproduto desidratado da cultura da ervilha (ERV) e cana-de-açúcar (CANA). O peso médio das cordeiras no início do experimento foi de 26,35kg. Os animais foram abatidos em frigorífico com inspeção sanitária federal. Foram avaliados o pH inicial e o final, as perdas por cocção, a cor, por meio do sistema CIELAB, a força de cisalhamento e a quantidade de sarcômeros em 100μm. Os pesos de carcaça quente, de carcaça fria e de meia-carcaça foram afetados pelos tratamentos (P<0,05). O comprimento do sarcômero do músculo Tríceps brachii 24 horas após o abate diferiu entre dietas e o feno coast cross apresentou o menor valor. O comprimento do sarcômero diferiu significativamente entre as dietas, e o subproduto da ervilha apresentou o menor número de sarcômeros imediatamente após o abate em comparação com as outras dietas. Não houve influência da dieta sobre as características de colorimetria, perda por cocção e força de cisalhamento. Houve diminuição do pH, seguido pelo desenvolvimento do processo de rigor mortis nos músculos Longíssimus lumborum e Tríceps brachii da primeira hora até 24 horas após o abate. As dietas não foram capazes de alterar o pH, a capacidade de retenção de água, a colorimetria ou a força de cisalhamento. O subproduto de ervilha e a cana-de-açúcar podem substituir as fontes tradicionais de forragem sem prejudicar as características da carne.

ABSTRACT The aim of this study was to evaluate the effect of different agricultural products on quantitative aspects of carcass, body constituents, cooking loss, shear force and colorimetry of the Longissimus lumborum and Triceps brachii muscles in Santa Ines lambs. 24 Santa Ines female lambs received one of four diets which were isoproteic and isoenergetic with fixed levels of forage (60%) and concentrate (40%) of corn and soybean meal during 45 days. The forages per diet differed: coast-cross hay (HAY), cassava hay (CASS), dehydrated by-product of pea crop (PEA) and sugarcane (SC). The average weight of the lambs at the beginning of the experiment was 26.35kg. Animals were slaughtered in a federally certified abattoir. Initial and final pH, cooking losses, color using the CIELAB system, shear force and the quantity of sarcomeres per 100μm were measured. Hot carcass, cold and half carcass weights were affected by treatments (P<0.05). The sarcomere length of Triceps brachii muscle 24 hours after slaughter differed between diets and coast-cross hay had the lowest value. The sarcomere length differed significantly between diets and the dehydrated by-product of pea crop had the lowest number of sarcomeres immediately after slaughter compared to other diets. There was no influence of diet on colorimetry, cooking loss and shear force. The decrease in pH followed the development of the process of rigor mortis in the Longissimus lumborum and Triceps brachii muscles in the first hour and up to 24 hours after slaughter. Diets did not alter the pH, water holding capacity, colorimetry or shear force. The pea by-product and sugarcane can replace traditional sources of fodder without depreciation of meat characteristics.

https://doi.org/10.1590/1678-4162-8681 1089 downloads

Update of the Brazilian floristic list of Algae and Cyanobacteria
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Menezes, Mariângela

; Bicudo, Carlos E. M.

; Moura, Carlos W. N.

; Alves, Aigara M.

; Santos, Alana A.

; Pedrini, Alexandre de G.

; Araújo, Andréa

; Tucci, Andrea

; Fajar, Aurelio

; Malone, Camila

; Kano, Cecília H.

; Sant'Anna, Célia L.

; Branco, Ciro Z.

; Odebrecht, Clarisse

; Peres, Cleto K.

; Neuhaus, Emanuel B.

; Eskinazi-Leça, Enide

; Aquino, Eveline

; Nauer, Fabio

; Santos, Gabriel N.

; Amado Filho, Gilberto M.

; Lyra, Goia M.

; Borges, Gyslaine C.P.

; Costa, Iara O.

; Nogueira, Ina de S.

; Oliveira, Ivania B.

; Paula, Joel. C.de

; Nunes, José M. de C.

; Lima, Jucicleide C.

; Santos, Kleber R.S.

; Ferreira, Leandro C.

; Gestinari, Lísia M.S.

; Cardoso, Luciana S.

; Figueiredo, Marcia A.O.

; Silva, Marcos H.

; Barreto, Maria B.B.B.

; Henriques, Maria C.O.

; Cunha, Maria da G.G.S.

; Bandeira-Pedrosa, Maria E.

; Oliveira-Carvalho, Maria F.

; Széchy, Maria T.M.

; Azevedo, Maria T.P.

; Oliveira, Mariana C. de

; Cabezudo, Mariê M.

; Santiago, Marilene F.

; Bergesh, Marli

; Fujii, Mutuê T.

; Bueno, Norma C.

; Necchi Jr., Orlando

; Jesus, Priscila B.

; Bahia, Ricardo G.

; Khader, Samir

; Alves-da-Silva, Sandra M.

; Guimarães, Silvia M.P.B.

; Pereira, Sonia M.B.

; Caires, Taiara A.

; Meurer, Thamis

; Cassano, Valéria

; Werner, Vera R.

; Gama Jr., Watson A. da

; Silva, Weliton J. da

Rodriguésia

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2015, Volume 66 N. 4 Pages 1047 - 1062

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Apresenta-se uma síntese atualizada de informações sobre algas no Brasil objetivando refinar os dados reunidos até o presente, bem como avaliar os avanços sobre o conhecimento da diversidade de algas no país desde a publicação do Catálogo de Plantas e Fungos do Brasil. Os resultados de 2015 mostraram um acréscimo de 1.250 espécies (35.7%) a um total de 4.747 em relação a 2010. As classes mais diversas em número de espécies foram Bacillariophyceae, Conjugatophyceae, Florideophyceae, Cyanophyceae, Dinophyceae e Euglenophyceae. Bacillariophyceae e Cyanophyceae tiveram o maior acréscimo de espécies no intervalo de cinco anos. A região Sudeste e Sul foram as mais diversas, porém, as regiões Nordeste com os estados do Piauí e Sergipe e Centro-Oeste com os estados de Mato Grosso, Goiás e Distrito Federal destacaram-se no cenário da biodiversidade nacional. Apesar da escassez de taxonomistas e da infraestrutura limitada, os resultados obtidos evidenciaram um avanço significativo no conhecimento da diversidade de algas no país nesse período de cinco anos, iniciando uma mudança quanto as diferenças geográficas regionais.

Abstract An updated synthesis of cyanobacteria and algae information is presented for Brazil aiming to refine the data gathered to date and evaluate the progress of the biodiversity knowledge about these organisms in the country since the publication of the Catálogo de Plantas e Fungos do Brasil. The results of 2015 showed an increase of 1,250 species (35.7%) when compared to 2010, reaching a total of 4,747 species. The most diverse classes in species number were the Bacillariophyceae, Conjugatophyceae, Florideophyceae, Cyanophyceae, Dinophyceae and Euglenophyceae. Bacillariophyceae and Cyanophyceae had the highest increase in species number in the five-year interval. The Southeast and South regions were the most diverse, however, the Northeast, with the states of Piauí and Sergipe, and the Central-west region, with Mato Grosso, Goiás and Distrito Federal, also stood out in the national algal biodiversity scenario. Despite the shortage of taxonomists and limited infrastructure, the results showed a significant improvement in the knowledge regarding the diversity of cyanobacteria and algae in the country during the study period, starting to even out regional geographical differences caused by subsampling.

https://doi.org/10.1590/2175-7860201566408 4865 downloads

Effects of therapeutic approach on the neonatal evolution of very low birth weight infants with patent ductus arteriosus
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Sadeck, Lilian S.R.

; Leone, Cléa R.

; Procianoy, Renato S.

; Guinsburg, Ruth

; Marba, Sergio T.M.

; Martinez, Francisco E.

; Rugolo, Ligia M.S.S.

; Moreira, M. Elisabeth L.

; Fiori, Renato M.

; Ferrari, Ligia L.

; Menezes, Jucille A.

; Venzon, Paulyne S.

; Abdallah, Vânia Q.S.

; Duarte, José Luiz M.B.

; Nunes, Marynea V.

; Anchieta, Leni M.

; Alves Filho, Navantino

Jornal de Pediatria

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dec 2014, Volume 90 N. 6 Pages 616 - 623

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

OBJETIVO: Analisar os efeitos da terapêutica adotada para o canal arterial (CA) em recém-nascidos (RN) < 1.000gadmitidos em unidades neonatais (UN) da Rede Brasileira de Pesquisas Neonatais (RBPN), sobre os desfechos: óbito, displasia broncopulmonar (DBP), hemorragia intraventricular grave (HIVIII/IV), retinopatia da prematuridade cirúrgica (ROPcir), enterocolite necrosante cirúrgica (ECNcir) e o desfecho combinado óbito e DBP. MÉTODOS: Estudo multicêntrico, de coorte, coleta de dados retrospectiva, incluindo RN de 16 UN da RBPN de 01/01/2010 a 31/12/2011, PN < 1.000 g, idade gestacional (IG) < 33 semanas e diagnóstico ecocardiográfico de PCA. Excluídos: óbitos ou transferências até o terceiro dia de vida, infecções congênitas ou malformações. Grupos:G1 - conservadora (sem intervenção medicamentosa ou cirúrgica), G2 - farmacológica (indometacina ou ibuprofeno) e G3 - cirúrgico (com ou sem tratamento farmacológico anterior). Analisou-se: uso de esteroide antenatal, parto cesárea, PN, IG, Apgar5' < 4, sexo masculino, SNAPPE II, síndrome do dDesconforto respiratório (SDR), sepse tardia, ventilação mecânica (VM), surfactante < 2 horas de vida, tempo de VM e os desfechos: óbito, dependência de oxigênio com 36 semanas (DBP36s), HIV III/IV, ROPcir, ECNcir e óbito/DBP36s. Estatística: Teste t-Student, Qui-Quadrado ou teste Exato de Fisher. Testes de Regressão Binária Logística e Regressão Múltipla Stepwise Backward. MedCalc (Medical Calculator) software, versão 12.1.4.0.p < 0,05. RESULTADOS: Foram selecionados 1.097 RN e 494 foram incluídos: G1-187 (37,8%), G2-205 (41,5%) e G3-102 (20,6%). Verificou-se: maior mortalidade (51,3%) no G1 e menor no G3(14,7%); maior frequência DBP36s (70,6%) e ROPcir (23,5%) no G3; maior frequência de óbito/DBP36s no G2 (58,0%). As abordagens farmacológica (OR-0,29; 95%, IC-0,14-0,62) e conservadora (OR-0,34; 95%, IC- 0,14-0,79) foram protetoras somente para o desfecho óbito/DBP36sem. CONCLUSÃO: Em RN com PCA, a abordagem conservadora relacionou-se à maior mortalidade, a cirúrgica à ocorrência de DBP36s e ROPcir., enquanto o tratamento farmacológico mostrou-se protetor para o desfecho óbito/DBP36sem.

OBJECTIVE: To analyze the effects of treatment approach on the outcomes of newborns (birth weight [BW] < 1,000 g) with patent ductus arteriosus (PDA), from the Brazilian Neonatal Research Network (BNRN) on: death, bronchopulmonary dysplasia (BPD), severe intraventricular hemorrhage (IVH III/IV), retinopathy of prematurity requiring surgical (ROPsur), necrotizing enterocolitis requiring surgery (NECsur), and death/BPD. METHODS: This was a multicentric cohort study, retrospective data collection, including newborns (BW < 1000 g) with gestational age (GA) < 33 weeks and echocardiographic diagnosis of PDA, from 16 neonatal units of the BNRN from January 1, 2010 to Dec 31, 2011. Newborns who died or were transferred until the third day of life, and those with presence of congenital malformation or infection were excluded. Groups: G1 - conservative approach (without treatment), G2 - pharmacologic (indomethacin or ibuprofen), G3 - surgical ligation (independent of previous treatment). Factors analyzed: antenatal corticosteroid, cesarean section, BW, GA, 5 min. Apgar score < 4, male gender, Score for Neonatal Acute Physiology Perinatal Extension (SNAPPE II), respiratory distress syndrome (RDS), late sepsis (LS), mechanical ventilation (MV), surfactant (< 2 h of life), and time of MV. Outcomes: death, O2 dependence at 36 weeks (BPD36wks), IVH III/IV, ROPsur, NECsur, and death/BPD36wks. Statistics: Student's t-test, chi-squared test, or Fisher's exact test; Odds ratio (95% CI); logistic binary regression and backward stepwise multiple regression. Software: MedCalc (Medical Calculator) software, version 12.1.4.0. p-values < 0.05 were considered statistically significant. RESULTS: 1,097 newborns were selected and 494 newborns were included: G1 - 187 (37.8%), G2 - 205 (41.5%), and G3 - 102 (20.6%). The highest mortality was observed in G1 (51.3%) and the lowest in G3 (14.7%). The highest frequencies of BPD36wks (70.6%) and ROPsur were observed in G3 (23.5%). The lowest occurrence of death/BPD36wks occurred in G2 (58.0%). Pharmacological (OR 0.29; 95% CI: 0.14-0.62) and conservative (OR 0.34; 95% CI: 0.14-0.79) treatments were protective for the outcome death/BPD36wks. CONCLUSION: The conservative approach of PDA was associated to high mortality, the surgical approach to the occurrence of BPD36wks and ROPsur, and the pharmacological treatment was protective for the outcome death/BPD36wks.

https://doi.org/10.1016/j.jped.2014.04.010 5181 downloads

Características clínico-epidemológicas do carcinoma epidermóide de cavidade oral no sexo feminino
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CARVALHO, M.B. DE

; LENZI, J.

; LEHN, C.N.

; FAVA, A.S.

; AMAR, A.

; KANDA, J.L.

; WALDER, F.

; MENEZES, M.B.

; FRANZI, S.A.

; MAGALHÃES, M.R. DE

; CURIONI, O.A.

; MARCEL, R.

; SZELIGA, S.

; A. SOBRINHO, J. DE

; RAPOPORT, A.

Revista da Associação Médica Brasileira

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sep 2001, Volume 47 N. 3 Pages 208 - 214

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

OBJETIVO: Este trabalho tem como objetivo identificar as principais diferenças clínico-epidemiológicas do carcinoma epidermóide de cavidade oral no sexo feminino quando comparado ao sexo masculino. MÉTODOS: Foram estudados retrospectivamente os prontuários de 228 pacientes do sexo feminino portadoras de carcinoma epidermóide de cavidade oral, atendidos no Serviço de Cirurgia de Cabeça e Pescoço do Hospital Heliópolis, no período entre 1977 e 1996. As características clínico-epidemiológicas destas pacientes foram comparadas com aquelas de 849 pacientes do sexo masculino. RESULTADOS: A idade das pacientes das mulheres variou de 2 a 100 anos, com uma média de 60,7 anos. Nos homens encontramos idade entre 17 e 88 anos com uma média de 55,6 (p<0,00001). Quando o etilismo e o tabagismo estavam ausentes, a incidência do carcinoma epidermóide de boca ocorreu em uma faixa etária mais tardia. A presença do tabaco isoladamente não afetou a distribuição por faixa etária, enquanto que o álcool isoladamente ou em associação com o tabaco leva a uma incidência mais precoce do câncer de boca. Os dois principais sítios de incidência são a língua e o soalho. As mulheres têm uma menor incidência de lesões de língua e soalho (43%) quando comparado aos homens (61%). Aproximadamente 50% das mulheres eram estadio III e IV no momento do diagnóstico. Entre os homens este índice atinge 53%. CONCLUSÕES: O carcinoma epidermóide de cavidade oral nas mulheres tem características clínico-epidemiológicas peculiares que justificam o desenvolvimento de protocolos de diagnóstico e tratamento específico para ele.

BACKGROUND: Squamous cell carcinoma (SCC) of the oral cavity occurs mainly in the male population. The objective of the study is to identify the main clinical and epidemiological differences of the oral SCC between men and women. METHODS: Retrospective analysis of the charts of 228 cases of SCC of the oral cavity in women treated at the Head & Neck Surgery Service, Heliopolis Hospital, São Paulo, Brazil from 1977 to 1996. The clinical and epidemiological characteristics of these cases were compared with those of 849 male patients. RESULTS: The mean age of women was 60.7 years (ranging 2 to 100 years) and in the male group was 55.6 years (p<0.00001). In cases where the alcohol intake and tobacco use were absent, the tumors ocurred in older patients. The isolated tobacco use didn't affect the distribuction by age but for the alcohol intake (alone or combined with tobacco) the patients were younger. On the alcohol intake, 71% of the women and 8% of the man used no alcohol. The most common sites of tumors were tongue and floor of the mouth but in the women group the incidence of tumors in these sites were 43% compared with 61% in the men. CONCLUSIONS: The highest incidence of SCC the of oral cavity occurs later in women, than in men. This could be explained by a lesser exposure to alcohol and tobacco in women. Other factors seem to be involved in this issue.

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Curso de epidemiologia básica para pneumologistas. 4ª parte - Epidemiologia clínica
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Menezes, Ana M.B.

; Santos, Iná da S. dos

Jornal de Pneumologia

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dec 1999, Volume 25 N. 6 Pages 321 - 326

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10.

The d Expansion and the Principle of Minimal Sensitivity
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Krein, G.

; Menezes, D.P.

; Nielsen, M.

; Pinto, M.B.

Brazilian Journal of Physics

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mar 1998, Volume 28 N. 1 Pages 66 - 71

Abstract: En | Text: En | PDF: En

The d-expansion is a nonperturbative approach for field theoretic models wich combines the techniques of perturbation theory and the variational principle. Different ways of implemeting the principle of minimal sensitivity to the d-expansion produce in general different results for observables. For illustration we use the Nambu- Jona-Lasinio model for chiral symmetry restoration at finite density and compare results with those obtained with the Hartree-Fock approximation.

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