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Revista de Saúde Pública

Print version ISSN 0034-8910

Rev. Saúde Pública vol.43 n.4 São Paulo Aug. 2009 Epub May 29, 2009

http://dx.doi.org/10.1590/S0034-89102009005000031 

ARTIGOS ORIGINAIS

 

Performance of a Brazilian population on the test of functional health literacy in adults

 

Desempenho de uma população brasileira no teste de alfabetização funcional para adultos na área de saúde

 

Desempeño de una población brasilera en la prueba de alfabetización funcional para adultos en el área de salud

 

 

Maria Teresa Carthery-Goulart; Renato Anghinah; Renata Areza-Fegyveres; Valeria Santoro Bahia; Sonia Maria Dozzi Brucki; Antonio Damin; Ana Paula Formigoni; Norberto Frota; Carla Guariglia; Alessandro F Jacinto; Eliane Mayumi Kato; Edson P Lima; Letícia Mansur; Daniel Moreira; Ana Nóbrega; Claudia Selitto Porto; Mirna L H Senaha; Mari-Nilva Maia da Silva; Jerusa Smid; Juliana N Souza-Talarico; Marcia Radanovic; Ricardo Nitrini

Departamento de Neurologia. Faculdade de Medicina. Universidade de São Paulo. São Paulo, SP, Brasil

Correspondência | Correspondence

 

 


ABSTRACT

OBJECTIVE: To analyze the scoring obtained by an instrument, which evaluates the ability to read and understand items in the health care setting, according to education and age.
METHODS: The short version of the Test of Functional Health Literacy in Adults was administered to 312 healthy participants of different ages and years of schooling. The study was conducted between 2006 and 2007, in the city of São Paulo, Southeastern Brazil. The test includes actual materials such as pill bottles and appointment slips and measures reading comprehension, assessing the ability to read and correctly pronounce a list of words and understand both prose passages and numerical information. Pearson partial correlations and a multiple regression model were used to verify the association between its scores and education and age.
RESULTS: The mean age of the sample was 47.3 years(sd=16.8) and the mean education was 9.7 years(sd=5; range: 1 - 17). A total of 32.4% of the sample showed literacy/numeracy deficits, scoring in the inadequate and marginal functional health literacy ranges. Among the elderly (65 years or older) this rate increased to 51.6%. There was a positive correlation between schooling and scores (r=0.74; p<0.01) and a negative correlation between age and the scores (r=-0.259; p<0.01). The correlation between the scores and age was not significant when the effects of education were held constant (rp=-0.031, p=0.584). A significant association (B=3.877, Beta =0.733; p<0.001) was found between schooling and scores. Age was not a significant predictor in this model (B=-0.035, Beta=-0.22; p=0.584).
CONCLUSIONS: The short version of the Test of Functional Health Literacy in Adults was a suitable tool to assess health literacy in the study population. The high number of individuals classified as functional illiterates in this test highlights the importance of special assistance to help them properly understand directions for healthcare.

Descriptors: Adult. Educational Status. Comprehension. Education. Language Tests. Questionnaires. Validation Studies. Health Education. Patient Education as Topic.


RESUMO

OBJETIVO: Analisar os escores de instrumento que avalia habilidade de leitura e compreensão de materiais da área da saúde segundo escolaridade e idade.
MÉTODOS: Foram avaliados 312 participantes saudáveis de diferentes idades por meio da versão reduzida do instrumento Test of Functional Health Literacy in Adults. O estudo foi realizado entre 2006 e 2007 na cidade de São Paulo (SP). O instrumento envolve materiais como frascos de medicamentos e cartões de agendamento de consultas, avaliando a compreensão de leitura e de conceitos numéricos. Os testes de correlação parcial e de Pearson e um modelo de regressão múltipla foram usados para verificar a associação entre os escores no instrumento, escolaridade e idade.
RESULTADOS: As médias de idade e de escolaridade da amostra foram respectivamente 47,3 (dp=16,8 ) e 9,7 (dp=5; de um a 17 anos de estudo). O total de 32,4% da amostra mostraram déficits de alfabetização funcional/ uso de conceitos numéricos na área de saúde, com desempenho inadequado ou limítrofe no instrumento. Entre idosos (65 anos ou mais) esta taxa atingiu 51,6%. Encontrou-se correlação positiva entre anos de estudo e escores no instrumento (r=0,740; p<0,01) e correlação negativa entre idade e escores no instrumento (r=-0,259; p<0,01). A correlação entre escores no instrumento e idade não foi significante quando os efeitos da escolaridade foram controlados (r=-0,031, p=0,584). Uma associação significante (B=3,877, Beta=0,733; p<0,001) foi encontrada entre anos de estudo e escores no instrumento. A idade não foi uma variável preditiva no modelo (B=-0,035, Beta=-0,22; p=0,584).
CONCLUSÕES: O instrumento é adequado para avaliar a alfabetização funcional em saúde na população brasileira. O elevado número de indivíduos classificados como analfabetos funcionais indica a importância de adoção de medidas especiais para ajudar estes indivíduos a compreenderem corretamente as orientações para cuidados de saúde.

Descritores: Adulto. Escolaridade. Compreensão. Educação. Testes de Linguagem. Questionários. Estudos de Validação. Educação em Saúde. Educação de Pacientes como Assunto.


RESUMEN

OBJETIVO: Analizar los escores de instrumento que evalúa habilidad de lectura y comprensión de materiales del área de salud según escolaridad y edad.
MÉTODOS: Fueron evaluados 312 participantes saludables de diferentes edades por medio de la versión reducida del instrumento Test of Functional Health Literacy in Adults. El estudio fue realizado entre 2006 y 2007 en la ciudad de Sao Paulo (Sureste de Brasil). El instrumento incluye materiales como frascos de medicamentos y cartones de para marcar consultas, evaluando la comprensión de lectura y de conceptos numéricos. Las pruebas de correlación parcial y de Pearson y un modelo de regresión múltiple fueron usados para verificar la asociación entre los escores en el instrumento, escolaridad y edad.
RESULTADOS: Los promedios de edad y de escolaridad de la muestra fueron respectivamente 47,3 (dp=16,8) y 9,7 (dp=5; de uno a 17 años de estudio). El total de 32,4% de la muestra mostraron déficit de alfabetización funcional/uso de conceptos numéricos en el área de salud, con desempeño inadecuado o limítrofe en el instrumento. Entre ancianos (65 años o más) esta tasa afectó 51,6%. Se encontró correlación positiva entre años de estudio y escores en el instrumento (r=0,740; p< 0,01) y correlación negativa entre edad y escores en el instrumento (r=-0,259; p< 0,01).La correlación entre escores en el instrumento y edad no fue significativa cuando los efectos de la escolaridad fueron controlados (r=-0,031, p=0,584). Una asociación significativa (B=3,877, Beta=0,733; p< 0,001) fue encontrada entre años de estudio y escores en el instrumento. La edad no fue una variable predictiva en el modelo (B=-0,035, Beta=-0,22; p=0,584).
CONCLUSIONES: El instrumento es adecuado para evaluar la alfabetización funcional en salud en la población brasilera. El elevado número de individuos clasificados como analfabetos funcionales indica la importancia de adopción de medidas especiales para ayudar estos individuos a comprender correctamente las orientaciones para cuidados de salud.

Descriptores: Adulto. Escolaridad. Comprensión. Educación. Pruebas del Lenguaje. Cuestionario. Estudios de Validación. Educación en Salud. Educación del Paciente como Asunto.


 

 

INTRODUCTION

Functional illiteracy can be understood as the inability to use printed and written information to function in society, to achieve goals and to develop knowledge and potential.15 Functional illiterates are likely to have significant difficulties with routine reading requirements, such as those in pill bottles, appointment slips, self-care instructions, and health education brochures.8,12,13,22,24 This problem affects the health care system, because, by not managing health problems effectively, these individuals are prone to require more appointments and to have higher hospitalization rates, implying extra-costs for the system. There are several levels of functional literacy and many instruments have been especially designed with the purpose of identifying and measuring those levels.14,15

Assessing and determining levels of functional literacy is very important in the health care system to develop different ways of conveying information to individuals with limited reading and written comprehension skills so as to assure that they can understand and carry out medical directions concerning their health treatments (e.g. medication intake and chronic disease management). In mental health particularly, tests and questionnaires are usually employed to evaluate cognitive dysfunction and psychiatric symptoms.4,11 However, they are usually influenced by cultural and educational aspects.1,21 Adjustments are usually made according to completed years of schooling5,6,7 and batteries that suffer less influence of educational background have been developed in an attempt to minimize the influence of this variable.16-18,23 Nevertheless, there are limitations in using years of schooling as a single measure to account for those cultural and educational influences. For instance, it is not uncommon to find individuals with few years of formal education who are able to read complex materials due to their professional activities or personal interests (e.g. reading habits). On the other hand, people with few or even several years of schooling may be functional illiterates. Therefore, establishing levels of functional illiteracy and adjusting test scores according to this variable can result in better diagnostic accuracy of cognitive tests.

The Test of Functional Health Literacy in Adults (TOFHLA) was designed in 1995 to measure patients' ability to read and understand items they commonly encounter in the health care setting using actual materials such as pill bottles and appointment slips.19 It measures reading comprehension, including not only the ability to read and correctly pronounce a list of words, but also the ability to read and understand both prose passages and numerical information. Hence, it is a more accurate indicator of a patient's reading ability and is considered an effective tool for identifying patients who have inadequate functional health literacy.3 In a study developed in two public hospitals in the United States, a third of the patients were found to be unable to read basic materials related to health and the prevalence of individuals with this difficulty was significantly higher among the elderly.24 In order to reduce TOFHLA's time of administration, a shorter version of this test was developed.3 The S-TOFHLA had a similar reliability and validity similar to the full TOFHLA requiring a maximum time of 12 minutes to be completed.3

As a part of the research on developing or adjusting tests to cognitively evaluate individuals from a population with heterogeneous educational background, the present study aimed to analyze the scoring obtained by an instrument that evaluates the ability to read and understand items in the health care setting according to education and age.

 

METHODS

We obtained permission from the author for the application of the S-TOFHLA. The English and Spanish versions of S-TOFHLA were translated and adapted to the Brazilian reality, especially the reading comprehension texts as to convey information about the Sistema Único de Saúde (Brazilian Health System - SUS). When sentences needed to be modified for this purpose, the same structure was kept, using stimuli in the alternatives which were either phonetically similar to the target or that belonged to the same grammar class.

The numeracy test evaluates quantitative literacy needed in the health care setting. It comprises two medicine bottles and two cards containing information about medicine intake, date of appointments and results of a laboratorial test. The reading comprehension test is comprised by two health-related passages with a total of 36 items (blank spaces). The first text contains information about preparation for a gastrointestinal exam. The second is about rights and responsibilities of patients receiving health care in a hospital. Each passage has every fifth or sixth word deleted; for each blank space, the respondent must select from a list of four words the one that best completes the sentence.

The total score of the reading comprehension texts is 72 points, and every blank space correctly completed scores 2 points. The numeric items total 28 points, and seven points are scored for each correct response. The total score of the test is 100 points. Individuals scoring between zero and 53 points are considered in the inadequate range; between 54 and 66 points, in the marginal range and between 67 and 100, in the adequate range.

Subjects were healthy volunteers recruited preferably among those who use services of a university hospital and of other hospitals that provide health services through the SUS in the city of São Paulo, in Southeastern Brazil. The study was conducted from August 2006 to July 2007. Inclusion criteria were the following: 1) age > 18 years; 2) at least one year of schooling or self-reported informal acquisition of reading skills (subjects who did not attend school but were able to read were considered as having one year of schooling); 3) not suffering from neurological or psychiatric disorders or using drugs that affect cognition; 4) having a minimum visual acuity of 20/40 as determined with a pocket vision screener (Rosenbaum, Graham-Field Surgical Co, Inc, New Hyde Park, NY) and adequate hearing acuity to perform the test (correction for the deficit allowed); 5) subjects who were older than 64 years were required to have an informant to report absence of cognitive decline or of functional impairment characterized by a score higher than 1 at the Questionnaire of Functional Activities;20 6) not having untreated chronic conditions such as hypertension, diabetes mellitus and heart disease; 7) Not having alcoholism.

Participants were interviewed to collect information about sociodemographic data and about their health status to determine visual acuity. A structured questionnaire to evaluate the educational level of parents, type of school attended and reading habits of participants was also applied. S-TOFHLA was then administered by neurologists, speech and language therapists, psychologists, occupational therapists, nurses and post-graduate students. For the numeracy items, patients were given cards or pill bottles to read and subsequently asked oral questions about the information. For reading comprehension, the texts were given to participants, who had to choose the best alternatives to fill in the 36 blank spaces. The maximum time allowed to completion of this task was seven minutes, after which the individual was asked to stop. When the participant preferred to finish the task, the items completed after this period of seven minutes were not analyzed.

Descriptive statistics were used to summarize quantitative information about the total sample, and means and standard deviations for age, schooling and scores in the S-TOFHLA were determined. Calculations of the proportion of individuals who provided correct responses for the numeracy and text items and of the proportion of individuals classified in the inadequate, marginal and adequate ranges were performed.

S-TOFHLA scores were submitted to a one-way analysis of variance (ANOVA) followed by post-hoc comparisons (Tukey), when significant differences were detected. Chi-square test was utilized to compare the gender distribution of the groups. Pearson correlation coefficients were used to verify the relationship between S-TOFHLA scores and age and years of schooling. The partial correlation coefficient was also calculated to measure the strength of the relationship between S-TOFHLA scores and age when the effects of education were held constant and between S-TOFHLA scores and education when the effects of age were held constant.

The independent variables age and years of schooling were entered in a multiple linear regression model to assess the relative contribution of these variables to predict the S-TOFHLA scores.

A p-value of 0.05 was used to indicate statistical significance.

All the analyses were performed with the SPSS 13.0 software.

The study was approved by the Ethics Committee of the Hospital das Clínicas da Universidade de São Paulo (University of São Paulo, School of Medicine Clinical Hospital). All subjects were informed about the objectives and procedures involved in the study and written informed consent was given prior to the interviews and tests.

 

RESULTS

The Brazilian version of the S-TOFHLA was administered to 312 healthy participants (198 women and 114 men) distributed in three age groups (range 19-81 years, mean 47.3, sd=16.8) and four schooling groups (range 1-17 years of schooling, mean 9.9, sd=5), as shown in Table 1.

The mean ages and standard deviations (sd) of each schooling group were respectively 1-3 years of schooling, group 1: 56.15 (sd=14.17), 4-7 years of schooling, group 2: 53.25 (sd=16.87), 8-11 years of schooling, group 3: 45.76 (sd=16.99) and > 12 years of schooling, group 4: 42.18 (sd=15.46). The mean years of schooling for the three age groups were respectively: 18-50 years: 11.11 (sd=4.8); 54-64 years: 8.67 (sd=4.8); > 65 years: 7.65 (sd=4.8).

There was no difference regarding gender distribution among the 12 groups (χ2=12.374, df=11, p=0.336), among the four schooling groups (χ2=5.454, df=3, p=0.141) and among the three age groups (χ2 =3.133, df=2, p=0.209).

The S-TOFHLA was easily administrated and procedures for how to perform the tasks were easily understood by participants.

Performance on the S-TOFHLA according to age and years of schooling completed is presented in Table 2. S-TOFHLA mean scores significantly differed in the four education groups (F(3,308)=128.266, p< 0.001). All post-hoc analyses detected significant differences among the groups (p< 0.001 in all analyses) indicating higher mean scores for individuals in the more educated groups. Significant differences in S-TOFHLA mean scores were also found in the three age groups (F(3,309)=8.789, p< 0.001). Post-hoc analyses pointed to significant differences between the younger and the older groups (p< 0.001).

The proportion of individuals who provided correct responses for numeracy and reading comprehension items is shown in Table 3. Forty five per cent of the participants gave correct responses for the four numeracy items and 59.4% chose the correct alternative in more than 75% of the items of the reading comprehension part.

 

 

The S-TOFHLA classification according to age and years of school completed is shown in Table 4. Thirty two per cent of participants had scores in the inadequate or marginal range. The proportion of individuals with inadequate/marginal literacy increased in the age groups, ranging from 26% in subjects aged 18 to 50 up to 51.6% in those older than 64 years. Almost all patients (92.5%) who completed three years of schooling or less performed in the inadequate/marginal ranges and almost all patients (98.3%) with more than 11 years of schooling had adequate health functional literacy.

 

 

There was a positive correlation between years of schooling and S-TOFHLA scores, r=0.740 (p< 0.01) and a negative correlation between age and S-TOFHLA scores, r=-0.259 (p< 0.01). Partial correlation analysis showed no S-TOFHLA scores and age were not significantly correlated when the effects of education were held constant (r=-0.031, p=0.584). There was a significant correlation between the S-TOFHLA scores and years of schooling when the effects of age were held constant (r=0.718, p=0.000).

A multiple linear regression model to predict TOFHLA scores according to age and education was used. Using the Enter method, a significant model emerged (F(2,309)=187.356, p< 0.001); adjusted R square=0.545. Years of schooling was a significant predictor variable for performance in the S-TOFHLA (B=3.877, Beta=0.733; p< 0.001). Age was not a significant predictor in this model (B=-0.035, Beta=-0.22; p=0.584). The values of tolerance (0.896) and of the variance inflation factor (1.117) did not indicate levels of multicollinearity that could distort the regression variate.

 

DISCUSSION

The S-TOFHLA seemed to be an adequate tool to measure functional health literacy levels in Brazilian individuals in terms of administration. It is an ecological and straightforward test, easily understood by the individuals tested and not time-consuming (application lasting approximately ten minutes).

Almost a quarter of the participants in the present study were classified as health functional illiterates by the S-TOFHLA, meaning that they can not perform basic reading tasks necessary to understand written health care information. Another 9% had marginal reading skills. The proportion of these individuals was higher in low educated groups (one to seven years of schooling) and among the elderly, where more than 50% were classified as inadequate/marginal literacy level. This is particularly important for clinical and epidemiological studies on mental health in Brazil and other countries that have population with heterogeneous educational levels.

In studies conducted in the United States with the TOFHLA and the S-TOFHLA, roughly a third of patients were classified in the inadequate range and the prevalence of low literacy skills was clearly higher among the elderly.3,24 Although our findings support the qualitative results of other studies, a higher proportion of functional illiterates was reported in their sample compared to ours. This can be explained by the higher number of individuals with more than 12 years of schooling included in our sample compared to those studies. In this group of schooling, our study and those in the United States reported a very small number of individuals out of the adequate range.

Our results also corroborate those of another study performed in the city of São Pauloª which identified among young and older adults an important proportion of individuals (32.9%) who had either a very limited knowledge of written language or a level of aptitude in this domain that did not enable them to perform simple tasks such as identifying a single item of information expressed literally in a simple short text. In that study, low literacy levels were also found mainly among subjects who had not completed eight years of schooling. Additionally, those individuals were found to belong to lower socioeconomic classes of society, performing jobs that did not require much qualification.

There was a significant relationship between schooling and functional literacy levels in this study. S-TOFHLA results were highly correlated with years of schooling and this correlation was still high and significant when age effects were controlled.

In multiple regression models Beta coefficients give a measure of the contribution of each variable to the model and larger values indicate larger effects of those variables on TOFHLA scores. The results of our model indicated that schooling was a better predictor of performance than age and that for each year of schooling added there was an increase of 3.877 points in the S-TOFHLA score in average. Tolerance and variance inflation factor values pointed to low correlation between the predictor variables (age and schooling). This is a good finding when trying to draw inferences about the relative contribution of each predictor variable to the model.

A small proportion of individuals with one to seven years of education performed in the adequate range. On the other hand, among those who completed at least eight years of education, this proportion increased substantially. However, it is important to emphasize that there is a great heterogeneity in performance, particularly in the groups of medium education (four to 11 years). Therefore, years of schooling alone may not be a completely reliable indicator of reading comprehension skills. In truth, it may be difficult to identify patients with inadequate literacy in those groups without formal testing.

Measuring functional literacy levels can provide a better account of the reading skills of individuals receiving health care.2 Years of schooling completed alone is an inaccurate indicator of educational attainment, because it merely signifies education attempted rather than attained.2 Literacy level is both a better indicator of a person's ability to acquire knowledge and to cope with societal demands. It is also a better measure than years of schooling to study the relationship between education and health outcomes.2

The finding of low literacy skills among the elderly in our study is not surprising. From the 1930s to at least the 1950s, elementary school (four years) was still restricted to specific social segments. As a result, the mean education level among the elderly in Brazil is still very low, 3.4 years of schooling.b The relationship between schooling and literacy levels thus explains the high proportion of functional health illiterates among the elderly. Age was not strongly correlated with performance in the S-TOFHLA and the correlation between those variables was not significant when the effects of schooling were taken into account. However, qualitative data inspection of the data shows that mean scores of older individuals in the lower educated groups were higher than the scores of younger groups in the same schooling range. Conversely, among the more educated groups the opposite pattern was observed. Lower literacy levels among middle-aged adults probably reflect the influence of socioeconomic factors as well (as elementary and high school have become more and more accessible, those younger individuals might have needed to quit their studies for different reasons than their older counterparts, such as the need to start working very early in life). Another possibility is related to the decreased education quality in elementary school that followed its increased accessibility. Among the elderly, the mild decline in reading comprehension performance may be due to cognitive changes such as reduced working memory capacity and mental processing speed, mainly among individuals older than 70 years. As metacognitive skills are preserved in the healthy elderly, those deficits do not have a significant impact in functional activities.9 A study using the S-TOFHLA in a large sample of elderly individuals found a consistent reading comprehension decline in advanced ages, even when the effects of education and cognitive impairment are controlled.10 Further studies are necessary to address these issues including a higher number of older subjects.

Other important issue about functional illiteracy in the heath care setting is the identification of other factors that can predict functional illiteracy (socioeconomic indicators, reading and writing habits, and occupation, among others). It is also very necessary to investigate the relationship between functional illiteracy and cognitive measures. Additionally, the classification using the S-TOFHLA has to be compared to other functional literacy measures to find out where the cut-off scores are adequate for our population.

Some practical implications also emerge from the present study. Despite the considerable heterogeneity, Brazilian patients with seven or fewer years of schooling are very likely to have inadequate functional health literacy. Moreover, the prevalence of these individuals is higher among the elderly. Supplying special assistance to these patients may improve their ability to manage their medical conditions. These individuals may require more direct teaching and follow-up to help them take medications correctly, follow diet and exercise instructions, and understand plans to care for their medical conditions.3 Alternative methods of health education such as videos may also be used and tested. These type of materials provide verbal and visual inputs and are, therefore, beneficial to learning. A great proportion of those individuals have access to radio and free TV channels. As a result, the development of special programs that focus on certain medical conditions may also be useful.

Finally, screening for functional illiteracy in the health care setting may be helpful to identify those in need of special care. The Brazilian version of the S-TOFHLA may be a practical tool for this screening.

 

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Correspondência | Correspondence:
Maria Teresa Carthery-Goulart
R. Edson 917 - sala 4 - Campo Belo
04618-034 São Paulo, SP, Brasil
E-mail: carthery@uol.com.br

Received: 03/31/2008
Revised: 11/14/2008
Approved: 12/04/2008

 

 

Study presented at the VI Reunião de Pesquisadores em Doença de Alzheimer e desordens Relacionadas (VI RPDA - 6th Alzheimer's Disease and Related Disorder Researchers' Meeting) held in the city of Ouro Preto, Southeastern Brazil, on December 07th, 2006.
a Ribeiro VM. Letramento no Brasil. São Paulo: Ação Educativa/Fundação Paulo Montenegro; 2003.
b Instituto Brasileiro de Geografia e Estatística. Perfil dos idosos responsáveis pelos domicílios no Brasil [Internet]. 2000. [cited 2008 Jan 21]. Available from: http://www.ibge.gov.br/home/estatistica/perfilidoso