Sampling procedures and sample representativeness in a national telephone survey: a Portuguese example

Correia, Sofia; Dinis, Paulo; Rolo, F.; Lunet, Nuno

doi:10.1007/s00038-009-0102-2

Cited by 3 publications

(8 citation statements)

References 22 publications

(35 reference statements)

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“…Another challenge which required a review of the interviewing logistics was the proportion of closed households in the first sample in the initial stage of the study (18%). This aspect could be related to the time of the visit (during the day) (14,17,18) . Thus, the pursuit of scale interviews should address the different times of day and days of the week, seeking to vary the times and days of return addresses.…”

Section: Discussionmentioning

confidence: 99%

“…Most of the participants initially contacted in their homes said that they were busy or there was nobody available to answer the interviewer at the time. This is referred in the literature as inherent in this type of study (14,(17)(18)(19)(20)(21) . The way to approach the subject appears to be related to the acceptance to participate in the research; interviewers with experience in human research field was productive, since the average of interviews in a shift jumped from five to 25.…”

Section: Discussionmentioning

confidence: 99%

“…Incidence was higher for the question related to the perception of change in vocal emission associated with aging (F9). These items were kept and the non-response rates were considered when analyzing the data for prevalence purposes of verifiable SLS-H disorders (17)(18)(19)(20) . Despite the possibility of bias in regards to proxy responses, the accuracy of the information acquired could be corrected at the time of data analysis (15,25,26) .…”

Section: Discussionmentioning

confidence: 99%

“…In addition, in the next steps it is essential that more detailed data be available about the methodology used to estimate the distribution of SLS-H disorders in the population in relation to sex, age, education, and co-occurrence with other health problems (28) , considering the weight and estimated variance to the analysis (13,17,25) . In addition, knowledge of the burden of self-declared speech-language, swallowing and hearing disorders, even if they are related to subjective aspects of peception of the subject about his health, will contribute to managing demands for specific populations, something with unprecedent in the field, as we do not have yet know population data on the prevalence SLS-H disorders in the general population.…”

Section: Discussionmentioning

confidence: 99%

“…Since we did not find school-based population surveys of SLS-H disorders, our methodology was based in non-communicable diseases and/or disorders population surveys (10,16,17) .…”

Section: This Study Was Aproved By the Research Ethics Board Ofmentioning

confidence: 99%

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Inquérito domiciliar de distúrbios fonoaudiológicos autodeclarados: desenho e protocolo de pesquisa

Goulart

Martins-Reis

Chiari

2015

Audiol., Commun. Res.

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Purpose: This paper presents the methodology and research tools of a self-reported household survey of speech, language, swallowing and hearing (SLS-H) disorders implemented in southern Brazil. Methods:For the conduction of the study itself, a long step of planning and pilot activities was conducted. This included selection and training of field staff, development, test and retest measurement instrument of self-reported SLS-H disorders and approach techniques and completion of the questionnaires have been tested and applied, because of the complexity of the study. Results: The average time of interview varied from 35 to 15 minutes depending of interviewers experience and for both groups after some fieldwork the average time spent declined. The occurrence of "do not know or didn't inform" answer ranged from 0.2% (95% CI 0.0;1.6) and 6.1% (95% CI 2.8;11.3). Its lowest occurrence was for questions relating to the history of hoarseness and tinnitus by proxys. Resultados: O tempo médio de entrevista variou de 15 a 35 minutos, dependendo da experiência dos entrevistadores e diminuiu para ambos os grupos, depois de algum tempo de trabalho de campo. A ocorrência de "não sabe ou não respondeu" variou de 0,2% (IC 95% 0,0;1,6) a 6,1% (IC 95% 2,8;11,3), foi menor para as questões relativas à história de rouquidão e zumbido respondida por substitutos e maior para a questão relacionada à percepção de alteração na emissão vocal associada ao envelhecimento. Conclusão: Inquérito domiciliar é um método viável e relevante para verificar a carga dos distúrbios fonoaudiológicos na população em geral, embora seja necessário contar com amplo conhecimento dos aspectos relacionados a essa metodologia de estudo, bem como de elementos importantes para a seleção e formação contínua dos entrevistadores, a fim de aumentar a participação da população investigada.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Since we did not find school-based population surveys of SLS-H disorders, our methodology was based in non-communicable diseases and/or disorders population surveys (10,16,17) .…”

Section: This Study Was Aproved By the Research Ethics Board Ofmentioning

confidence: 99%

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Inquérito domiciliar de distúrbios fonoaudiológicos autodeclarados: desenho e protocolo de pesquisa

Goulart

Martins-Reis

Chiari

2015

Audiol., Commun. Res.

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Prevalence of asthma in Portugal ‐ The Portuguese National Asthma Survey

Sá‐Sousa

Morais‐Almeida

Azevedo

et al. 2012

Clinical & Translational All

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BackgroundAsthma is a frequent chronic respiratory disease in both children and adults. However, few data on asthma prevalence are available in Portugal. The Portuguese National Asthma Survey is the first nationwide study that uses standardized methods. We aimed to estimate the prevalence of current asthma in the Portuguese population and to assess the association between ‘Current asthma’ and comorbidities such as upper airways disease.MethodsA cross-sectional, population-based, telephone interview survey including all municipalities of Portugal was undertaken. Participants were randomly selected to answer a questionnaire based on the Portuguese version of the GA2LEN survey. ‘Current asthma’ was defined as self-reported lifetime asthma and at least one of 3 symptoms in the last 12 months: wheezing, waking with breathlessness or having an asthma attack.ResultsData were obtained for 6 003 respondents, with mean age of 38.9 (95%CI 38.2-39.6) years and 57.3% females. In the Portuguese population, the prevalence of ‘Current asthma’ was 6.8% (95%CI 6.0-7.7) and of ‘Lifetime asthma’ was 10.5% (95%CI 9.5-11.6) Using GA2LEN definition for asthma, our prevalence estimate was 7.8% (95%CI 7.0-8.8). Rhinitis had a strong association with asthma (Adjusted OR 3.87, 95%CI 2.90-5.18) and the association between upper airway diseases and asthma was stronger in patients with both rhinitis and sinusitis (Adjusted OR 13.93, 95%CI 6.60-29.44).ConclusionsCurrent asthma affects 695 000 Portuguese, with a prevalence of 6.8%. People who reported both rhinitis and sinusitis had the highest risk of having asthma.

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Predicting participation of people with impaired vision in epidemiological studies

Ramos

Santana²,

Moreno

et al. 2018

BMC Ophthalmol

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BackgroundThe characteristics of the target group and the design of an epidemiologic study, in particular the recruiting methods, can influence participation. People with vision impairment have unique characteristics because those invited are often elderly and totally or partially dependent on help to complete daily activities such as travelling to study sites. Therefore, participation of people with impaired vision in studies is less predictable than predicting participation for the general population.MethodsParticipants were recruited in the context of a study of prevalence and costs of visual impairment in Portugal (PCVIP-study). Participants were recruited from 4 Portuguese public hospitals. Inclusion criteria were: acuity in the better eye from 0.5 decimal (0.30logMAR) or worse and/or visual field of less than 20 degrees. Recruitment involved sending invitation letters and follow-up phone calls. A multiple logistic regression model was used to assess determinants of participation. The J48 classifier, chi-square and Fisher’s exact tests were applied to investigate the possible differences between subjects in our sample.ResultsIndividual cases were divided into 3 groups: immediate, late and non-participants. A participation rate of 20% was obtained (15% immediate, 5% late). Factors positively associated with participation included years of education, annual hospital attendance, and intermediate visual acuity. Females and greater distance to the hospital were inversely associated with participation.ConclusionIn our study, a letter followed by a phone call was efficient to recruit a significant number of participants from a larger group of people with impaired vision. However, the improvement in participation observed after the phone call might not be cost-effective. People with low levels of education and women were more difficult to recruit. These findings need to be considered to avoid studies whose results are biased by gender or socio-economic inequalities of their participants. Young subjects and those at intermediate stages of vision impairment, or equivalent conditions, may need more persuasion than other profiles.Electronic supplementary materialThe online version of this article (10.1186/s12886-018-0889-9) contains supplementary material, which is available to authorized users.

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Sampling procedures and sample representativeness in a national telephone survey: a Portuguese example

Abstract: Despite the difficulties in reaching participants, this strategy may produce unbiased estimates for important health indicators.

Cited by 3 publications

References 22 publications

Inquérito domiciliar de distúrbios fonoaudiológicos autodeclarados: desenho e protocolo de pesquisa

Inquérito domiciliar de distúrbios fonoaudiológicos autodeclarados: desenho e protocolo de pesquisa

Prevalence of asthma in Portugal ‐ The Portuguese National Asthma Survey

Predicting participation of people with impaired vision in epidemiological studies

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