<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2176-6223</journal-id>
<journal-title><![CDATA[Revista Pan-Amazônica de Saúde]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Pan-Amaz Saude]]></abbrev-journal-title>
<issn>2176-6223</issn>
<publisher>
<publisher-name><![CDATA[Instituto Evandro Chagas. Secretaria de Vigilância em Saúde e Ambiente. Ministério da Saúde]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2176-62232015000200061</article-id>
<article-id pub-id-type="doi">10.5123/s2176-62232015000200008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Application of time series control charts to model and monitor the seasonality of norovirus]]></article-title>
<article-title xml:lang="pt"><![CDATA[Aplicação de gráficos de controle de séries temporais para modelagem e monitoramento da sazonalidade do norovírus]]></article-title>
<article-title xml:lang="es"><![CDATA[Aplicación de gráficas de control de series temporales para modelado y monitoreo de la estacionalidad del norovirus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Siqueira]]></surname>
<given-names><![CDATA[Jones Anderson Monteiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nunes]]></surname>
<given-names><![CDATA[Anna Alice Garcia Caldas]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferreira]]></surname>
<given-names><![CDATA[Milene Silveira]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Linhares]]></surname>
<given-names><![CDATA[Alexandre da Costa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos]]></surname>
<given-names><![CDATA[Edson Marcos Leal Soares]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gabbay]]></surname>
<given-names><![CDATA[Yvone Benchimol]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal do Pará Núcleo de Medicina Tropical ]]></institution>
<addr-line><![CDATA[Belém Pará]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal de Viçosa Departamento de Estatística ]]></institution>
<addr-line><![CDATA[Viçosa Minas Gerais]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Evandro Chagas/SVS/MS Seção de Virologia ]]></institution>
<addr-line><![CDATA[Ananindeua Pará]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Federal do Pará Instituto de Ciências Exatas e Naturais ]]></institution>
<addr-line><![CDATA[Belém Pará]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2015</year>
</pub-date>
<volume>6</volume>
<numero>2</numero>
<fpage>61</fpage>
<lpage>68</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iec.gov.br/scielo.php?script=sci_arttext&amp;pid=S2176-62232015000200061&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iec.gov.br/scielo.php?script=sci_abstract&amp;pid=S2176-62232015000200061&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iec.gov.br/scielo.php?script=sci_pdf&amp;pid=S2176-62232015000200061&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  INTRODUCTION: Time series control charts are tools that allow one to identify the nature of certain variations in a process, whether they are variations due to common causes, deemed of little importance, or to special causes. The goal of this study was to apply time series control charts to analyse the seasonality observed in norovirus infections in children admitted from May 2008 to April 2011 to a paediatric hospital in Belém City, Pará State, Amazon Region, Brazil.  MATERIALS AND METHODS: To apply the models, it was necessary to make the stationary series, which was performed by applying the first difference of monthly norovirus positivity rates. To construct the charts, Kolmogorov-Smirnov normality test was used to verify if the data were normally distributed.  RESULTS: During the three years, the highest prevalence was observed between September and October 2008 (63.6%) and February 2010 (62.1%). The study series was under statistical control, with a tendency for stability and no evidence of seasonality or cycle. No outlying values were observed, which strongly suggest that no atypical factor that could affect the stability of the series was present.  CONCLUSION: This study demonstrates the applicability of time series control charts in the seasonality analysis of several pathogens studied in the biomedical sciences, and it is the first time that this statistical method has been applied to assess the time distribution of norovirus.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO  INTRODUÇÃO: Os gráficos de controle de séries temporais são ferramentas que permitem identificar a natureza de certas variações em um processo, sejam elas variações devido a causas comuns, consideradas de pouca importância, ou a causas especiais. O objetivo deste estudo foi aplicar gráficos de controle de séries temporais para analisar a sazonalidade observada em infecções de norovírus, em crianças internadas no período de maio de 2008 a abril de 2011, em um hospital pediátrico na Cidade de Belém, Estado do Pará, Amazônia, Brasil.  MATERIAIS E MÉTODOS: Para aplicar os modelos, foi necessário fazer a série estacionária, realizada pela aplicação das primeiras diferenças de taxas de positividade do norovírus. Para construir os gráficos, foi utilizado o teste de normalidade de Kolmogorov-Smirnov, a fim de verificar se os dados foram distribuídos corretamente.  RESULTADOS: Durante os três anos, observou-se a maior prevalência entre setembro e outubro de 2008 (63,6%) e fevereiro de 2010 (62,1%). A série de estudo estava sob controle estatístico, com uma tendência para a estabilidade e nenhuma evidência de sazonalidade. Não foram observados valores periféricos que sugerem claramente que nenhum fator atípico pode prejudicar a estabilidade da série apresentada.  CONCLUSÃO: Este estudo demonstra a aplicabilidade de gráficos de controle de séries temporais na análise da sazonalidade de diversos patógenos estudados nas ciências biomédicas, sendo a primeira vez que este método estatístico foi aplicado para avaliar a distribuição temporal de norovírus.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  INTRODUCCIÓN: Las gráficas de control de series temporales son herramientas que permiten identificar la naturaleza de ciertas variaciones en un proceso, sean variaciones debido a causas comunes, consideradas de poca importancia, o a causas especiales. El objetivo de este estudio fue de aplicar gráficas de control de series temporales para analizar la estacionalidad observada en infecciones de norovirus, en niños internados en el período de mayo de 2008 a abril de 2011, en un hospital pediátrico en la Ciudad de Belém, Estado de Pará, Amazonia, Brasil.  MATERIALES Y MÉTODOS: Para aplicar los modelos, fue preciso hacer la serie estacionaria, realizada por aplicación de las primeras diferencias de tasas de positividad del norovirus. Para construir las gráficas, se utilizó la prueba de normalidad de Kolmogorov-Smirnov, con la finalidad de verificar si los datos habían sido distribuidos correctamente.  RESULTADOS: Durante los tres años, se observó una mayor prevalencia entre setiembre y octubre de 2008 (63,6%) y febrero de 2010 (62,1%). La serie de estudio estaba bajo control estadístico, con una tendencia a la estabilidad y ninguna evidencia de estacionalidad. No se observaron valores periféricos que sugieran claramente que ningún factor atípico puede perjudicar la estabilidad de la serie presentada.  CONCLUSIÓN: Este estudio demuestra la aplicabilidad de gráficas de control de series temporales en el análisis de la estacionalidad de diversos patógenos estudiados en las ciencias biomédicas, siendo la primera vez que este método estadístico fue aplicado para evaluar la distribución temporal de norovirus.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Time Series]]></kwd>
<kwd lng="en"><![CDATA[Seasonal Variation]]></kwd>
<kwd lng="en"><![CDATA[Norovirus]]></kwd>
<kwd lng="en"><![CDATA[Gastroenteritis.]]></kwd>
<kwd lng="pt"><![CDATA[Séries Temporais]]></kwd>
<kwd lng="pt"><![CDATA[Variação Sazonal]]></kwd>
<kwd lng="pt"><![CDATA[Norovirus]]></kwd>
<kwd lng="pt"><![CDATA[Gastroenterite.]]></kwd>
<kwd lng="es"><![CDATA[Series Temporales]]></kwd>
<kwd lng="es"><![CDATA[Variación Estacional]]></kwd>
<kwd lng="es"><![CDATA[Norovirus]]></kwd>
<kwd lng="es"><![CDATA[Gastroenteritis.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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