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Print version ISSN 0104-5687
Pró-Fono R. Atual. Cient. vol.22 no.4 Barueri Oct./Dec. 2010
Reading and writing assessment scales: preliminary reliability evidences*
Adriana de Souza Batista KidaI, **; Brasília Maria ChiariII; Clara Regina Brandão de ÁvilaIII
Doutoranda em Distúrbios da Comunicação Humana pela Universidade
Federal de São Paulo (Unifesp). Pesquisadora Associada do Núcleo
de Ensino, Assistência e Pesquisa em Escrita e Leitura (Neapel) do Departanmento
de Fonoaudiologia da Unifesp
IIFonoaudióloga. Livre-Docente pela Unifesp. Professora Titular da Disciplina dos Distúrbios da Comunicação Humana da Unifesp
IIIFonoaudióloga. Doutora em Distúrbios da Comunicação Humana pela Unifesp. Professora Associada do Departamento de Fonoaudiologia da Unifesp
reliability of Reading and Writing Assessment Instruments.
AIM: to investigate the reliability of two scales created to evaluate both reading and writing of children with ages between 8:0 and 11:11 years.
METHOD: two scales were created: a reading scale, composed of 12 testing items organized into four competency fields (letter knowledge and phonographemic relation, decoding of isolated items, reading fluency, reading comprehension), and a writing scale, with five items organized into three fields (letter writing and graphophonemic relation, codification of isolated items, writing construction). One hundred students (64 girls) from Public Schools, with ages raging between 8:0 and 11:11 years, were selected. Twenty students (12 girls) participated in the applicability study, resulting in the study version of the Scales. These scales were later applied to the remaining 80 students (52 girls). The obtained responses were assessed and computed for score assignment: item scores, competence field score (CFS) and raw scale score (RSS). Data were submitted to statistical analysis: the Cronbach's alpha coefficient was calculated and correlations between items (Pearson's correlation coefficient) were verified. A significance level of 0.05 was used.
RESULTS: a = 0.866 and a = 0.461 were obtained for the Reading and Writing Scales, respectively. Correlations between the items were observed, ranging from weak to strong, and confirmed the alpha values.
CONCLUSION: the Reading Scale was proven reliable, achieving acceptable levels for diagnostic instruments; the Writing Scale did not present an acceptable reliability level to measure the performance of the tested children.
Key Words: Reading; Handwriting; Assessment; Speech; Language and Hearing Sciences.
Like any other disorder, clinical identification of Reading and Writing Disorders needs valid, reliable, standardized and normalized instruments that are capable to support the diagnosis, definition of conduct and organization of intervention programs1. Protocols that do not meet these specifications may undermine the reliability of the clinical evidences needed for diagnosis2. Among the national tests available3-8, some evaluate aspects of underlying processes to reading and writing skills. However, these do not present reference norms and do not enable the comparison of the assessed performances. Other tests are restricted and specifically assess the recognition and decoding skills in reading and encoding of single items in writing during dictation without presenting any reference norms and reliability data. There are also tests with reference norms which, however, have no reliability data.
This study aimed to investigate the reliability of two scales designed to assess reading and writing of children from eight years to 11y11m, assuming the hypothesis that both scales of measurement would present characteristics of diagnostic instruments. To illustrate the importance of studying the measurement properties of the material proposed for diagnostic tests, the scales and particularly the method adopted for the preparation and reliability analysis of these instruments will be presented.
This study was approved by the IRB/UNIFESP (number 11.111/05). The study was divided into six stages, according to the standards for construction of cognitive evaluation tests1: development of scales, sample selection, preliminary study of applicability; application of scales and collection of responses; attribution of scores; study of internal consistency.
The elaboration of Reading Scales (RS) and Writing Scales (WS) considered the following rules: the defined objectives; the literature review of assessment methods; the definition of the test format; and the selection of assessment materials, test stimuli and analysis procedures.
A priori, it was decided that the scales would evaluate the performance of students from eight to 11y11m regarding the skills involved in learning and reading and writing capabilities. Following, indicators of reading 2, 9-11 and writing 12-15 performance appropriate to the defined age range, tests and assessment methods of reading 4; 16-20 and writing 3-4, 16, 21-23 were analyzed. From the abilities to be investigated, the following fields were delimited: knowledge of letters and of the graph-phonemic relationship; decoding of isolated items; text reading fluency and comprehension for RS; and knowledge of the phono-grapheme relationship; coding; and construction of writing for WS.
Test items were defined for each scale and were selected: the linguistic material, the assessment procedures (including application instructions), and criteria for performance analysis for each item.
In the preliminary version, the RS contained twelve test items and the WS, five (Table 1).
Participants were 100 schoolchildren (64 girls) between eight and 11y11m of age, from Second to Sixth grade of Public Elementary Schools. Participants were selected from 132 children nominated by teachers as having good academic performance. The selection of participants was determined according to the following inclusion criteria: absence of complaints or indicators of hearing and/or visual deficits; no neurological, behavioral or cognitive impairments; no complaints of difficulties or learning disabilities; no complaints of school performance; absence of retention in school history; signature of the consent form; passing the Speech, Language and Hearing screening6;24-25: tests of verbal and writing production and comprehension. Participants were divided into subgroups according to age: 8 - 8y11m; 9 - 9y11m; 10-10y11m; 11-11y11m. Five children of each subgroup were randomly selected to compose the sample of the Preliminary Applicability Study1 that evaluated the first version of the Scales and indicated the need for modifications. Scales were applied on the 20 children for observation of: duration of application of the test scales, effectiveness of instruction comprehension, difficulty degree of test stimuli proposed according to age group, and the functionality of Performance Record Sheets (FRD). Two test items from the WS and FRD of both scales were modified.
After the final version was determined, each of the 80 participants was evaluated during two sessions (35 minutes each) in school rooms with noise levels that did not interfere on the comprehension of the instructions.
We adopted a standardized scoring system to analyze the performance and enable the reliability study: scores per item, per field of competence (ecc) and total score per scale (cee).
The scores of items ranged from 2 to 0 and represented, respectively, better to poorer performance. The performances, quantified according to the criteria for analysis (Table 1), were tabulated for each child and statistically treated. Measures of central tendency were calculated and the median and the third quartile were adopted as parameters. Score attribution criteria were defined for items according to each age range. The median represents score 2, values between the median and the third quartile represent score 1, and values below the third quartile represent the score zero.
The ecc (sum of scores per item) reported the performance on each Competence Field and allowed to consider whether the items in each field examined a single competence. The cee (sum of ecc) reported the overall performance on the scales. It allowed verifying whether all the selected items were related to the construct of reading or writing.
The study of internal consistency of the scales fulfilled the purpose of analyzing the confiability1; 26: different test items should measure the same variable2 26. The inter-items internal consistency was analyzed 26 28. The responses of each participant were reevaluated and received a score (score per item). The other scores (ecc and ebe) were also computed for each participant.
The Statistical Analysis System version 13.0 was used for the analysis. The Cronbach's alpha coefficient (?) was applied to analyze the internal consistency by studying the degree of covariance of the items. The congruence of each item of a scale with other items that comprised the scale, and the effect of each item on the instrument, were verified through additional study of reliability after the removal of test items. Values of ? below 0.6 indicated degree of covariance at unacceptable levels; values between 0.6 and 0.7 indicated weak covariance; values between 0.7 to 0.8 indicated acceptable covariance; values 0.8 and 0.9 indicated good covariance degree; and values above 0.9 indicate very good covariance.
The level of significance for this study was 0.05.
The internal consistency of RS and its fields of competence (Table 1) exhibited a good degree of covariance for the fields of decoding isolated items, text reading fluency, and for the total scale. The field of reading comprehension showed very low degree of covariance.
The suppression of these items revealed that the ? values maintained the good covariance to decode isolated items (deletion of item 3: ? = 0.848; item 4: ? = 0.855; item 5: ? = 0.870; item 6: ? = 0.896), text reading fluency (deletion of item 7: ? = 0.855; item 8: ? = 0.812; item 9: ? = 0.893; item 10: ? = 0.848), and for the total RS (deletion of item 2: ? = 0.887; item 3: ? = 0.843; item 4: ? = 0.840; item 5: ? = 0.846; item 6: ? = 0.848; item 7: ? = 0.842; item 8: ? = 0.835; item 9: ? = 0.853 ; item 10: ? = 0.838; item 11: ? = 0.882; item 12: ? = 0.871). Because the fields of knowledge of letter and reading comprehension consisted of only two items, their internal consistency front the removal of items could not be analyzed.
The internal consistency of WS and its fields of competence (Table 2) revealed very low degrees of covariance. The internal consistency of writing construct was not analyzed because it is constituted by a single test item.
The exclusion of items 1 and 2 increased the covariance of this scale, which, however, did not increase the coefficient of WS to acceptable levels maintaining the very low variance (? = 0.506).
The remarkable importance of tests and assessment procedures in the clinical practice indicates that cognitive testing should have characteristics that demonstrate its measurement properties: validity and reliability. Tests and assessment procedures should provide accurate and stable performance in a particular skill; sensitivity and specificity in appropriately identifying healthy subjects and patients with alterations; and normative guidelines that are essential to the diagnose1-2, 26-27.
In order to meet these determinations, the elaboration of the Reading and Writing Scales followed the standards of tests construct1. The reliability study showed that the different selected tasks did not always examine the same pretended content or processing, indicating that selection of new assessment procedures should be performed. This would increase the security in collecting and analyzing the evidences that support scientific and clinical reasoning2.
The study of inter-items internal consistency - adopted as a form of evaluation of the scales - was performed to answer whether the selected items were related to an unique theoretical construct (sometimes understood as Reading sometimes as Writing) represented by ebe of each scale, or even like each one of the Fields of Expertise, represented by ecc. The presence of admissible values of covariance - higher than 0.728 - was required to certify the reliability of the instruments on the performance measurement properties according to age.
The selection of children from the Public School System of only one region (São Paulo) aimed at the same socio-cultural profile. The indication of the best schoolchildren by the teachers tried to minimize the influence of possible effects of language disorders and learning disabilities on the evaluation of the capability of measuring the instruments.
The adequacy of the RS for diagnosis was validated by the internal consistency of the Scale and of the isolated items of fields of decoding and text reading fluency. The selected items measured the same construct, demonstrating its reliability 26, 28-29. The field of knowledge of letters, for which ? was not calculated, showed a ceiling effect that prevented the analysis of internal consistency.
The field of reading comprehension was the only one that did not reach levels of diagnostic reliability. However, the exclusion of items 11 and 12 did not alter the consistency of the RS, suggesting that both contribute to the assessment of reading capacity. The use of different assessment procedures may require different skills and abilities to respond to the test26, possibly interfering on the internal consistency values. Thus, the low values of ? for the Field of comprehension may have been determined by the variability of the demands imposed by the evaluation procedures2: retelling the text read and answering multiple choice questions.
The internal consistency of WS revealed inadequate instrument for diagnostic29 or screening26. Thus, the theoretical concept that guided the construction of the WS was not properly represented by the items selected to compose this instrument. Two factors may have interfered: the heterogeneity of assessment procedures of test items and the absence of validity data attesting the reliability of the items selected from the literature to assess a particular construct.
The present research demonstrated the importance of the study and adoption of reliability parameters in the construction of instruments of clinical assessment. Moreover, the data indicated that RS must undergo further testing on its discriminating property, sensitivity and specificity to certify its accuracy for clinical use. Subsequently, one should proceed to the study of normalization, which will provide performance parameters of typically developing children according to age and education, diagnostic criteria established by DSM IV30. As for WS, items should be revised and the reliability restudied. Only these clinical studies will attest to the clinic the quality of the instruments in obtaining reliable data for diagnosis and therapeutic planning in Reading and Writing.
The reliability study of the Reading and Writing Scales indicated the possibility of using the RS to evaluate and diagnose competences related to letter knowledge and phono-grapheme relationship, decoding, and reading comprehension. In contrast, WS proved to be inadequate for measuring the performance of schoolchildren related to the knowledge of phono-grapheme relationship, coding, and construction of writing, requiring substantial revisions and re-evaluation of its measurement properties.
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Recebido em 01.12.2009. Artigo Submetido
a Avaliação por Pares
Revisado em 06.10.2010.
Aceito para Publicação em 30.11.2010.
Conflito de Interesse: não
* Trabalho Realizado na Unifesp sendo parte da Tese de Doutorado apresentada ao Departamento de Fonoaudiologia da Unifesp - Escola Paulista de Medicina, para Obtenção do Título de Doutor em Ciências, com Fomento da Agência Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
** Endereço para correspondência: R. Vitorino Carmilo, 606 - Apto. 63 - São Paulo - SP CEP 01153-000 (email@example.com).
Recebido em 01.12.2009.
a Avaliação por Pares