Letter to the Editor
Tuberculosis incidence rate among the homeless population: The impact of socio-demographic and health-related variables
a Pulmonology Department, Hospital de Braga, Braga, Portugal
b Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal
c ICVS/3B's, PT Government Associate Laboratory, Braga/Guimarães, Portugal
d EPIUnit, Public Health Institute, University of Porto, Porto, Portugal
e Occupational Health Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal
f Department of Mathematics, Faculty of Sciences, University of Porto, Porto, Portugal
g Centre of Mathematics, University of Porto, Porto, Portugal
h Pulmonology Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal
i Department of Clinical Epidemiology, Predictive Medicine and Public Health, Faculty of Medicine, University of Porto, Porto, Portugal
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Vieira, O. Oliveira, M. Gomes, R. Gaio, R. Duarte" "autores" => array:5 [ 0 => array:4 [ "nombre" => "A.L." "apellidos" => "Vieira" "email" => array:1 [ 0 => "analuisapvieira@gmail.com" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor0005" ] ] ] 1 => array:3 [ "nombre" => "O." "apellidos" => "Oliveira" "referencia" => array:3 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">c</span>" "identificador" => "aff0015" ] 2 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">d</span>" "identificador" => "aff0020" ] ] ] 2 => array:3 [ "nombre" => "M." 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"apellidos" => "Duarte" "referencia" => array:3 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">d</span>" "identificador" => "aff0020" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">h</span>" "identificador" => "aff0040" ] 2 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">i</span>" "identificador" => "aff0045" ] ] ] ] "afiliaciones" => array:9 [ 0 => array:3 [ "entidad" => "Pulmonology Department, Hospital de Braga, Braga, Portugal" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal" "etiqueta" => "b" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "ICVS/3B's, PT Government Associate Laboratory, Braga/Guimarães, Portugal" "etiqueta" => "c" "identificador" => "aff0015" ] 3 => array:3 [ "entidad" => "EPIUnit, Public Health Institute, University of Porto, Porto, Portugal" "etiqueta" => "d" "identificador" => "aff0020" ] 4 => array:3 [ "entidad" => "Occupational Health Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal" "etiqueta" => "e" "identificador" => "aff0025" ] 5 => array:3 [ "entidad" => "Department of Mathematics, Faculty of Sciences, University of Porto, Porto, Portugal" "etiqueta" => "f" "identificador" => "aff0030" ] 6 => array:3 [ "entidad" => "Centre of Mathematics, University of Porto, Porto, Portugal" "etiqueta" => "g" "identificador" => "aff0035" ] 7 => array:3 [ "entidad" => "Pulmonology Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal" "etiqueta" => "h" "identificador" => "aff0040" ] 8 => array:3 [ "entidad" => "Department of Clinical Epidemiology, Predictive Medicine and Public Health, Faculty of Medicine, University of Porto, Porto, Portugal" "etiqueta" => "i" "identificador" => "aff0045" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1694 "Ancho" => 3319 "Tamanyo" => 495553 ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Time evolution of homeless TB patients, HIV/TB co-infection, alcohol abuse among TB patients and elderly population (per 100<span class="elsevierStyleHsp" style=""></span>000 inhabitants) by district.</p>" ] ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Tuberculosis (TB) is an example of a long-standing epidemic: it has evolved over more than 2000 years and is the ninth leading cause of death worldwide and the leading cause of infectious disease.<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> Homelessness is widely acknowledged as a TB risk factor: in fact, the need to address the most vulnerable and hard-to-reach groups – among which the homeless are listed – has been recently highlighted in an action framework aiming at the elimination of TB in low-incidence countries.<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a> In Portugal, data from 2011 shows that TB incidence among homeless was five times higher than within the general population.<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> This study intended to identify socio-demographic and health-related variables in the general population and among TB patients that are associated with TB incidence in the homeless population.</p><p id="par0010" class="elsevierStylePara elsevierViewall">This was a retrospective study focused on a seven-year period (2008–2014) and on the 18 districts of mainland Portugal. Information regarding TB incidence and patients’ characteristics, such as homelessness status (defined as someone living in the streets with no shelter or lacking a fixed address), HIV co-infection, foreign-born, alcohol abuse (based on subjective information – CAGE questionnaire<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">4</span></a>) and illicit drug abuse (considered if there are withdrawal or tolerance symptoms, not including occasional consumption) was extracted from the Portuguese TB surveillance system (SVIG-TB). Socio-demographic and health-related data, such as total population, population density, working age population (aged 15–64 years), elderly population (aged ≥65 years), immigrant population, unemployed population, physicians (proportion in the population) and HIV notification rate, were collected from Statistics Portugal, Employment and Vocational Training Institute and National Health Institute Doutor Ricardo Jorge.</p><p id="par0015" class="elsevierStylePara elsevierViewall">The longitudinal effect of the studied variables on the incidence rate of TB among the homeless was estimated by a mixed-effects linear regression model with: (1) a random intercept taking the inter-district variability into account; (2) a residuals variance function depending exponentially on the fitted values.<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> Comparison between models was based on the likelihood ratio test for nested models and on the Akaike Information Criteria (AIC) otherwise.<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> Statistical analysis was performed with the R language and software environment for statistical computation, version 3.3.2.<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">7</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">TB incidence rate in mainland Portugal has steadily decreased from 24 cases per 100<span class="elsevierStyleHsp" style=""></span>000 inhabitants in 2008 to 17 cases per 100<span class="elsevierStyleHsp" style=""></span>000 inhabitants in 2014. However, the incidence rate of TB among the homeless has not accompanied the same decreasing trend: it remained approximately stable from 1.2 cases per 100<span class="elsevierStyleHsp" style=""></span>000 inhabitants in 2008 to 0.97 cases per 100<span class="elsevierStyleHsp" style=""></span>000 inhabitants in 2014.</p><p id="par0025" class="elsevierStylePara elsevierViewall">Our results indicate that TB incidence rate among homeless people is associated with HIV co-infection and alcohol abuse among TB patients and the proportion of elderly people in the overall population. <a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a> describes the longitudinal evolution of homeless TB patients per 100<span class="elsevierStyleHsp" style=""></span>000 inhabitants per district and the predictors found to be associated. <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a> describes the results obtained from the fitted regression model: briefly, an increase of 100 HIV co-infected cases or alcohol abusers among TB patients is associated with an increase on the incidence of TB among the homeless by an average of 14 or 11 cases per 100<span class="elsevierStyleHsp" style=""></span>000 population, respectively. The proportion of elderly people has a smaller impact: an increase of 1000 elderly persons in the general population is associated with an increase on the incidence of TB among the homeless by an average of 3 cases per 100<span class="elsevierStyleHsp" style=""></span>000 population.</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0030" class="elsevierStylePara elsevierViewall">The relationship between alcohol abuse and TB, as well as between TB and the elderly, has been previously acknowledged.<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">8,9</span></a> Moreover, HIV co-infection is universally recognized as the single most important risk factor for TB in regions with a high TB burden.<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a> Importantly, both alcohol abuse and HIV infection have been previously associated to homeless TB patients.<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">Our study has a number of strengths that ought to be highlighted: we collected data from the whole of mainland Portugal for a period of seven years, obtained from several national institutions. On the other hand, a few limitations should also be acknowledged: although TB notification is mandatory, reporting coverage may be particularly low among the homeless, given that this high-risk group may tend to avoid primary care facilities, delaying or preventing a timely TB diagnosis; and finally, as all data was extracted from national databases, we were limited by the degree of completeness and accuracy, as well as by the variables considered, which may have left out important indicators.</p><p id="par0040" class="elsevierStylePara elsevierViewall">Overall, this study allowed us to conclude that preventive interventions targeting HIV co-infected and alcohol abusers among TB patients, as well as the elderly in the general population, may decrease TB incidence rate among homeless people. In fact, although an early diagnosis and effective treatment remains the cornerstone strategy, complementing this approach with preventive measures targeting social determinants and biological risk factors, such as the ones highlighted, may be useful to achieve the target of TB elimination in Portugal and other low-burden countries.</p><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Funding</span><p id="par0050" class="elsevierStylePara elsevierViewall">This work was supported by the contribution of Iceland, Liechtenstein and Norway, through the <span class="elsevierStyleGrantSponsor" id="gs1">EEA</span> Grants, under the Public Health Initiatives Programme (PT 06), grant number <span class="elsevierStyleGrantNumber" refid="gs1">138DT1</span>. Olena Oliveira was supported by the project NORTE-08-5369-FSE-000041, financed by the <span class="elsevierStyleGrantSponsor" id="gs2">Operational Program Norte 2020</span> and co-financed by the European Social Fund through a doctoral grant (<span class="elsevierStyleGrantNumber" refid="gs2">UMINHO/BD/47/2016</span>). Rita Gaio was partially supported by CMUP (UID/MAT/00144/2013), which is funded by <span class="elsevierStyleGrantSponsor" id="gs3">FCT (Portugal)</span> with national (<span class="elsevierStyleGrantSponsor" id="gs4">MEC</span>) and European structural funds (<span class="elsevierStyleGrantSponsor" id="gs5">FEDER</span>), under the partnership agreement PT2020.</p></span><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Specific author contributions</span><p id="par0045" class="elsevierStylePara elsevierViewall">Ana Luísa Vieira drafted the manuscript, Olena Oliveira and Marta Gomes supported data collection, Rita Gaio provided the statistical analysis, Raquel Duarte conceived and designed the study and all authors revised the manuscript and approved its final version.</p></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Conflicts of interest</span><p id="par0190" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:5 [ 0 => array:2 [ "identificador" => "sec0010" "titulo" => "Funding" ] 1 => array:2 [ "identificador" => "sec0005" "titulo" => "Specific author contributions" ] 2 => array:2 [ "identificador" => "sec0065" "titulo" => "Conflicts of interest" ] 3 => array:2 [ "identificador" => "xack370372" "titulo" => "Acknowledgments" ] 4 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "multimedia" => array:2 [ 0 => array:7 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1694 "Ancho" => 3319 "Tamanyo" => 495553 ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Time evolution of homeless TB patients, HIV/TB co-infection, alcohol abuse among TB patients and elderly population (per 100<span class="elsevierStyleHsp" style=""></span>000 inhabitants) by district.</p>" ] ] 1 => array:8 [ "identificador" => "tbl0005" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at1" "detalle" => "Table " "rol" => "short" ] ] "tabla" => array:2 [ "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head " align="" valign="top" scope="col" style="border-bottom: 2px solid black"> \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Coefficient \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Standard Error \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">t</span>-Statistic \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">p</span>-value \t\t\t\t\t\t\n \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Intercept \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">−0.285 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.365 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">−0.782 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.436 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">TB patients with HIV co-infection<a class="elsevierStyleCrossRef" href="#tblfn0005"><span class="elsevierStyleSup">a</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.136 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.040 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">3.398 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">TB patients with alcohol abuse<a class="elsevierStyleCrossRef" href="#tblfn0005"><span class="elsevierStyleSup">a</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.109 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.032 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">3.357 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Elderly population<a class="elsevierStyleCrossRef" href="#tblfn0010"><span class="elsevierStyleSup">b</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.003 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.002 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">1.773 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.079 \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab1864253.png" ] ] ] "notaPie" => array:2 [ 0 => array:3 [ "identificador" => "tblfn0005" "etiqueta" => "a" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Described by number per 100<span class="elsevierStyleHsp" style=""></span>000 population</p>" ] 1 => array:3 [ "identificador" => "tblfn0010" "etiqueta" => "b" "nota" => "<p class="elsevierStyleNotepara" id="npar0010">Described by number per 1000 population.</p>" ] ] ] "descripcion" => array:1 [ "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Estimates obtained from the fitted regression model evaluating the effects of HIV co-infection and alcohol abuse among TB patients, and the proportion of elderly population, in the longitudinal evolution of the TB incidence rate among homeless people. The standard deviation of the random effect was estimated at 0.138 (0.057–0.339) while the power of the variance exponential function was of 0.595 (0.232–0.959).</p>" ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0015" "bibliografiaReferencia" => array:10 [ 0 => array:3 [ "identificador" => "bib0055" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:3 [ "comentario" => "doi:WHO/HTM/TB/2017.23" "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Global tuberculosis report 2017" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "WHO" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Libro" => array:1 [ "fecha" => "2017" ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib0060" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Towards tuberculosis elimination: an action framework for low-incidence countries" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => "K. 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