Showing 14 results for Validity
H Lashkardoost, B Zeighami, M Mahmoudi, J Hassanzadeh, A Hamedi, Hr Tabatabaee, F Sameemanesh, Sm Kashfi,
Volume 6, Issue 1 (6-2010)
Abstract
Background & Objective: Because of uncertainty in interpretation of some tests for diagnosing TB, decision making for the tuberculosis treatment is based on multiple diagnostic tests. This study was conducted to assess the accuracy of Quanti FERON-TB Gold test in tuberculosis diagnosis.
Methods: The study was carried out on 30 cases and 46 controls. Statistical indices of sensitivity, specificity, positive predictive value, negative predictive value, likelihood ratios, odds ratio and Receiver Operating Characteristics (ROC) curve were estimated.
Results: Sensitivity of QFT-G was 90.0% (95% CI=73.0-97.6), specificity 95.7% (95% CI=83.8-99.3), positive predictive value 93.1% (95% CI=76.3-98.9), negative predictive value 93.6% (95% CI=81.3-98.4). The area under ROC curve was 0.942 (95% CI=0.88-1.00), that significantly differed from chance diagonal area (P<0.0001). The optimum cut point for the Quanti FERON-TB Gold test was 0.35 IU/ml, with sensitivity of 0.90 and specificity of 0.957.
Conclusions: The Quanti FERON-TB Gold test displayed good validity indices in this study. Since the utility of this test has a high cost therefore this test would not be offered for routine tuberculosis detection. It suggested that this test are applicable for smear and culture negative tuberculosis, child tuberculosis, and assessment of TB contact tracing.
I Abdollahpour, S Nedjat, M Noroozian, R Majdzadeh,
Volume 6, Issue 4 (3-2011)
Abstract
Background & objectives: Content validity is the first type of validity that has to be ensured during the design of a tool. Its prerequisite for other validities and its close relationship with the tool reliability place it in a vital position in the questionnaire design. However, since it has not been paid enough attention in national publications therefore in this paper we will explain the different steps in preparing an appropriate content for questionnaires and also their assessment.
Methods: The steps of the content validation process for designing valid and reliable questionnaires have been explained in this paper: development (domain identification, items generation and instrument construction), Judgment – quantification (determining the inter rater agreement among experts, determining the clarity and relevancy of each of the questions along with the clarity, relevancy and comprehensiveness of the tool as a whole) have been explained.
Conclusions: The benefits of performing the content validation in questionnaire development are not increasing the possibility of accessing desirable content validity indexes (relevancy, clarity, and comprehensiveness) only, but also improving the Reliability indexes of tool and decreasing need for resources (financial and temporal) are the other benefits of this approach. Although subjective nature of experts’ responses is the problematic issue in this process but the more quantitative steps of the content validation has reduced considerable part of previous worries about this process. These issues explain why content validation has become a suitable process for questionnaire
A Ansarifar, H Soori, Akbarzadeh Bagheban, ,
Volume 9, Issue 1 (5-2013)
Abstract
Background and Objectives: The purpose of this study was to assess the reliability and validity of Persian version of survey instrument for Behavioral Risk Factor Surveillance System (BRFS).
Methods: Content and Face validity of Behavioral Risk Factor Surveillance System (BRFS) questionnaire were examined with Backward-Forward method. This method consisted of four steps: translation, back-translation, expert review and Pilot study. For evaluation of reliability of questionnaire, 194 adults of 18 years or older from Karaj province were interviewed. For the examination of reliability, Cronbach’s alpha was calculated to assess the internal consistency of the questionnaire. The reliability of quantitative variables evaluated with intra class correlation (ICC) ordinal variables with weighted Kappa and nominal variables with Kappa and weighted Kappa were calculated as well.
Results: Average age of participants were 38.8 15. Majority of participants (66.5%) were in 18-44 years group, 26.8% in 45-64 years and others 65 years and older. In validity procedure, 26 questions were deleted, 3 questions added and 6 questions were modified. Questions of ‘having situations of HIV morbidity’ and ‘Do you currently use drug abuse’ were least reliability and deleted from questionnaire. Others were reliable. (It might be better to say how many questions remained finally)
Conclusion: Our results indicate that BRFSS Persian version questionnaire has acceptable reliability and criterion validity for surveillance system in Iran.
Sj Tabibi, Z Rezaie Mohammadi , T Allahviranloo, Mh Taghdisi,
Volume 10, Issue 3 (12-2014)
Abstract
Background & Objectives : Leadership power and management are discussed as sensitive and key elements in the safety issue. A safety leader can provide the necessary incentives for hard work, efficiency, and more productivity in the organization which includes various working groups and also strengthening a sense of individual responsibility to promote the safety performance in order to achieve the organizational goals. This study aimed to determine the validity and reliability of the Safety Leadership Questionnaire in the vehicle manufacturing industry.
Methods : This cross-sectional study was conducted on 260 employees of Pars-Khodro Company in the manufacturing lines. All samples were selected randomly. The validity of the questionnaire was determined by statistical methods such as exploratory factor analysis, confirmatory factor analysis, and the heterogeneity between questions. Also, the Cronbach's alpha was used in order to investigate the reliability of the questionnaire.
Results: The results of exploratory factor analysis showed three factors including decision making, control, and incentives explained 66 percent of the total variance. Confirmatory factor analysis represented the appropriate fitness of information with a three-component structure (P<0.001, df = 2, 𝜒 2 = 5.36, CFI = 0.957, RMSEA = 0.089). The Cronbach's alpha coefficient was higher than 0.7 for all three factors.
Conclusion : In this research, decision making was an important factor in measuring safety leadership. Moreover, the present study represented an indicator which could be used in the other surveys of safety and industrial psychology.
H Hatami, A Gharib, A Khodamoradi,
Volume 12, Issue 2 (8-2016)
Abstract
Background and Objectives: Hirschsprung's disease is one of the congenital movement disorders of the bowel whose accurate and timely diagnosis in childhood is important. The disease occurs due to lack of ganglion cells in the distal part of the digestive system and leads to functional obstruction of the colon. Recently, by the frozen section method, the diagnosis and treatment of the disease is possible through one-stage surgery with fewer complications and lower costs without the need for early colostomy. The aim of this study was to evaluate the validity of frozen section in Hirschsprung's disease.
Methods: this retrospective study was done on 406 frozen section results obtained from patients admitted to Mofid Hospital during 1389-90. We evaluated the frequency of “positive” and “negative” samples and compared them with the results of the permanent section. Moreover, the validity, sensitivity, specificity, and positive and negative predictive value of frozen section were calculated.
Results: After examining 406 frozen section samples and comparison with the results of permanent section, the results were consistent for both methods in 369 cases (90.89%) while the results were inconsistent in 37 cases (9.11%). Frozen section showed 7 (1.7%) false negative and 30 false positive (7.3%) cases. The sensitivity, specificity, positive predictive value, and negative predictive value of frozen section was 94.44%, 89.29%, 79.87%, and 97.28%, respectively.
Conclusion: Frozen section is a good tool for screening and diagnosis. Its power to rule out the disease is rather more than its power to confirm its presence. so it is capable of ruling out the disease in 97% and confirming its presence in 80% of the cases.
M Nejatifar , H Soori, M Ghaffari,
Volume 13, Issue 2 (9-2017)
Abstract
Background and Objectives: A feasible and cost-effective tool is required to investigate young children' behaviors with regard to the risk of injury. The aim of this study was to assess the psychometrics of the Persian version of the Injury Behavior Checklist (IBC).
Methods: After validating the translation (backward-forward translation), the final version of the checklist was developed through content analysis and face validity and according to the comments of a panel of experts. The final version was distributed among 300 mothers of children aged 2-5 years referring to the kindergartens of Tehran. Convergent validity was evaluated by internal consistency through calculation of Cronbach's alpha coefficient, as well as item-total correlation. The reliability of the checklist was assessed through the test-retest method with participating 55 mothers and comparison of the scores of the two steps by correlation coefficient and interclass correlation coefficient (ICC).
Results: The content validity ratio was acceptable (0.6-1) for 100% of the items, and the content validity index was 0.93 for relevancy and clarity and 0.92 for simplicity. The Cronbach's alpha coefficient was 0.87. All 24 items of the IBC were acceptably and directly correlated with the total score of the tool (r=0.25-0.65). Reliability results also confirmed the test-retest reliability of the Persian version of the IBC (r=0.90; ICC=0.86).
Conclusion: The Persian version of the IBC is a reliable tool for investigation of risk taking and its association with different injuries in children aged 2-5 years.
M Habibi, S Alahdadi, M Salari, N Ghanbari ,
Volume 13, Issue 3 (12-2017)
Abstract
Background and Objectives: The current study was conducted to assess factor structure, validity, and reliability of the Persian version of the Drug Use Disorders Identification Test (DUDIT) among drug abusers in many city of Iran. It also assessed the DUDIT scores of a number of demographic factors.
Methods: The LDQ underwent forward translation to to Persian abackward translation to English. Furthermore, it was compared with the original scale. We made essential changes after it was used by 20 participants. Two hundred and eighty one drug abusers from prisons, dormitories, and rehabilitation camps completed the questionnaire. A demographic questionnaire as well as the Drug Use Disorders Identification Test (DUDIT), Severity of Dependence Scale (SDS), and Leeds Dependence Questionnaire (LDQ) were used to collect data. Methods used for data analysis included Confirmatory factor analysis, Cronbach’s alpha coefficient, Guttman split-half coefficient and convergent reliability.
Results: Findings supported the unidimensional structure of the DUDIT. The Cronbach’s alpha and Guttman scale score were 0.81 and 0.68, respectively. The convergent validity through calculation of the correlation coefficient of the DUDIT with LDQ and SDS was 0.61 and 0.46, respectively. History of drug abuse in the family, residence in rehabilitation camps, taking several substances simultaneously, and use several methods of drug abuse simultaneously obtained the highest score in the DUDIT.
Conclusion: The Persian version of the DUDIT has suitable psychometric properties in drug abusers. It is important to pay attention to the demographic factors affecting drug use disorders for prevention and treatment plans.
J Ahmadpour, Sz Asghari, Ar Soltanian, Y Mohammadi, J Poorolajal,
Volume 14, Issue 1 (6-2018)
Abstract
Background and Objectives: This study assessed the validity and reliability of the Persian version of the standard "Problematic Internet Use" questionnaire to be used in epidemiological studies.
Methods: This cross-sectional study was performed in 2016. This questionnaire comprises five domains, including preference for online social interaction, mood regulation, cognitive preoccupation, compulsive Internet use, and negative outcomes. The questionnaire has 15 questions with a total score ranges from 15 to 105. A score of 15-45 indicates a normal state, a score of 46-65 shows a mild disorder, a score of 66-85 suggests a moderate disorder, and a score of 86-105 reveals a severe disorder.
Results: Three hundred and seven students (31.1%) had a normal score, 445 (45.1%) had a mild disorder, 191 (19.4%) had a moderate disorder, and 43 (4.4%) had a severe disorder. Based on CVR, 10 questions had a validity of 100%, 3 questions had a validity of 80%, 1 question had a validity of 40%, and 1 question had a validity of zero. The overall validity of the questionnaire was 85.3%. Based on alpha coefficient, the reliability of the domain of preference for online social interaction, mood regulation, cognitive preoccupation, compulsive Internet use, and negative outcomes was 87.6%, 91.1%, 89.8%, 90.8%, and 86.2%, respectively. The overall reliability of the questionnaire was 92.5%.
Conclusion: The validity and reliability of the questionnaire were high; thus, it can be used as a standard tool in epidemiological studies to explore the pathology of injuries related to the Internet and social networks.
Ma Soleimani, S Zarabadi Pour , Y Yaghoobzadeh, S Pahlevan Sharif , H Sharif Nia ,
Volume 14, Issue 1 (6-2018)
Abstract
Background and Objectives: The effect of heart diseases on the quality of life is the issue needs attention of health care providers. Improving quality of life is considered as the goals of rehabilitative therapies. This study conducted to evaluate the McGill Quality of Life Questionnaire in patients with heart diseases.
Methods: In this cross-sectional study, 500 patients with heart diseases were recruited from BooAli Sina Hospital and Velayat Hospital affiliated with Qazvin University of Medical Sciences from May to August 2016. The participants completed the McGill Quality of Life Questionnaire. The construct validity (including convergent and discriminant validity) and Reliability using the Cronbach’s alpha, theta, and McDonald's Omega of the McGill Quality of Life Questionnaire were evaluated. The structure of the Questionnaire was assessed using factor analysis.
Results: Three factors, including overall view of the quality of life, physical aspect, and psychological dimension, were extracted. Model fit indexes confirmed a good fit of he McGill Quality of Life Questionnaire (Comparative of Fit Index: CFI=.918, incremental fit index: IFI=.919, Adjusted Goodness of Fit Index: AGFI=.844, RMSEA=.079, Minimum Discrepancy Function by Degrees of Freedom divided: CMIN/DF=2.97, Parsimonious Normed Fit Index: PNFI=.681, Parsimonious Comparative Fit Index: PCFI=.709). Convergent and divergent validity, internal consistency, and construct reliability of the questionnaire were confirmed.
Conclusion: The findings revealed that the three-factor model of the McGill Quality of Life Questionnaire has satisfactory validity and reliability. Thus, this questionnaire can be used in future studies to assess the quality of life of patients with heart diseases.
Mm Vakili, L Babakhani, S Sharifi, A Moazen, Z Mehrabi, K Kamali, M Namadian, E Shakibazadeh,
Volume 14, Issue 2 (9-2018)
Abstract
Background and Objectives: The pandemic of HIV/AIDS is spreading rapidly in the Middle East, in particular in Iran. Designing an educational program involves assessment of the educational needs of people with valid and culture-based tools. This study was conducted with the aim of psychometric analysis of an instrument for assessment of HIV/AIDS knowledge based on the Iranian culture in different population groups.
Methods: In this psychometric analysis, 58 items related to AIDS knowledge were prepared based on a literature review. Then, the face validity and content validity of the instrument was determent by the impact item score, content validity ratio (CVR), and content validity index (CVI). The reliability of the scale was assessed by Cronbach’s alpha coefficient and test-retest.
Results: Based on face validity and content validity, the research scale had 44 items with an item impact score > 1.5, a CVR > 0.49, and a CVI > 0.79. The Scale had three sections, general knowledge about HIV/AIDS (9 items), knowledge about HIV transmission (25 items), and knowledge about HIV/AIDS prevention (10 items). The Scale also had a high reliability (Cronbach’s alpha coefficient=0.77-0.91, ICC=0.88)
Conclusion: The results of the study showed the instrument was a valid and reliable scale for measurement of knowledge about HIV/AIDS.
Mm Vakili, A Moazen, S Sharifi, K Kamali,
Volume 14, Issue 3 (12-2018)
Abstract
Background and Objectives: The results of recent studies suggest that model-based health education programs are more effective in changing health behaviors. Interventional programs based on health education theories can be used to explain individual and psychological behavioral determinants in order to reduce the risk of HIV/AIDS. This study was conducted with the aim of psychometric analysis of an HIV scale based on model, population and culture of Iran.
Methods: We used qualitative and quantitative methods during August 2015 to December 2017. The items were generated based on a literature review and interviews with an expert panel. After providing a primary list of the instrument items, we used content and face validity. The first step of the study was done in a sample of medical and non-medical college and high school student from Zanjan. The exploratory factor analysis, internal consistency reliability, and test-retest reliability of the scale were measured.
Results: Fifty-eight items were generated from interviews with experts and review of the literature. After measuring the face and content validity, the items decreased to 53 items. The exploratory factor analysis discovered five factors (perceived susceptibility, severity, benefits, barriers, and self-efficacy), including 30 items for high school students and 31 for university students, that predictive more than 58% of the observed variance. The Cronbach’s alpha coefficient for the sub-scales ranged from 0.80 to 0.86, and the ICC was above 0.86.
Conclusion: The results showed that the HBM was a valid and reliable tool for measuring the HIV/AIDS beliefs and could be used in future investigations.
S Baridkazemi, E Mosafarkhani, R Eftekhari Gol , A Taghipour, A Bahonar, O Emami, Hr Bahrami,
Volume 14, Issue 3 (12-2018)
Abstract
Background and Objectives: Researchers and health specialists are increasingly using self-reports to obtain information on chronic illnesses. This study was conducted to assess the validity of self-reports of diabetes based on a recent field survey in Mashhad.
Methods: In this cross-sectional study, we used the results of 2015 census in Mashhad, a population based survey of people over the age of 30 (n =307103), to determine the proportion of self-reported diabetes. The patient records of Sina Electronic Health Record system (SinaEHR®) coded as E11 and E12 approved by doctors were used as a reference. The sensitivity, specificity, positive predictive value, and negative predictive value were calculated with 95% confidence intervals.
Results: The sensitivity, specificity, PLR, NLR, PPV, and NPV of self-reported diabetes was 24.59% (95% CI: 23.97-25.21), 98.04% (95% CI: 97.99-98.09), 12.56% (95% CI: 12.11-13.02), 0.77% (95% CI: 0.76-0.78), 44.77% (95% CI: 43.89-45.67), and 95.27% (95% CI: 95.23-95.31), respectively. The sensitivity of self-reported diabetes was higher in men, Iranian individuals, single subjects, people aged 60 and over, individuals with a BMI of 18.5-25, and those with university education.
Conclusion: Although the sensitivity of self-reported diabetes was poor in this study, its specificity and positive and negative predictive values were good. Furthermore, the sensitivity of self-reported diabetes was higher in men, Iranian individuals, single subjects, people aged 60 and over, individuals with a BMI of 18.5-25, and those with university education. It seems that caution should be exercised in using self-reported data in epidemiological studies.
Fereshteh Eidy, Hoosein Fallahzadeh, Rahman Panahi, Jamshid Jamali,
Volume 18, Issue 3 (12-2022)
Abstract
Background and Objectives: Today, overweight and obesity are among the significant challenges in the world. They can have adverse effects on quality of life. Quality of life is determined by social and physical environment. The present study investigated the construct validity of the Persian version of the Impact of Weight on Quality of Life (IWQOL-lite) questionnaire using multilevel confirmatory factor analysis.
Methods: The present study was conducted on 310 people over 18 years old living in Yazd city. The data were analyzed using m-plus6.2 software.
Results: The mean age of the participants in this study was 33.97± 4.70 years. Sixty percent (N=183) of subjects were male. The indices of the one-level model were more appropriate than those of the two-level model, and the one-level confirmatory factor analysis model had a good fitting to the data (CLI: 0.98, TLI: 0.98, RMSEA: 0.038).
Conclusion: The results of this study indicated the need for more effectiveness of urban areas on quality of life. The one-level confirmatory factor analysis model confirmed the construct validity of the IWQOL-lite questionnaire. This questionnaire can be used in the Iranian population.
Ali Jafari-Khounigh, Morteza Haghighi, Alireza Razzaghi, Shahram Habibzadeh, Seyed Taghi Heydari, Rasoul Entezarmahdi, Dr. Alireza Ansari Moghaddam, Hamid Sharifi, Mostafa Farahbakhsh, Mahdi Rezaei, Mina Golestani, Ehsan Sarbazi, Naser Nasiri, Homayoun Sadeghi-Bazargani,
Volume 19, Issue 3 (12-2023)
Abstract
Background and Objectives: Masks play a crucial role in preventing and controlling viral epidemics transmitted predominantly through the air. This study aimed to develop and validate a tool to measure people’s attitudes and behaviors related to mask usage during highly contagious viral epidemics.
Methods: In this psychometric study, the initial questionnaire was developed and face validity and content validity were assessed by 17 experts and three lay experts. Reliability was evaluated through internal consistency using Cronbach’s alpha and test-retest reliability using the Intraclass Correlation Coefficient (ICC). Construct validity was measured using exploratory factor analysis (EFA) with the principal component extraction method and Varimax rotation.
Results: Based on a review of previous studies, an initial 27-item questionnaire was crafted. During the face validity stage, two items were excluded. Through calculating the Content Validity Ratio (CVR) and the Content Validity Index (CVI), three and one items respectively removed. The average scale level content validity index (S-CVI/Ave) was 0.95. Cronbach's alpha coefficient was found to be 0.76 for attitude and 0.66 for practice sections; the ICC was equal to 0.873. EFA revealed two factors explaining 63.98% of the total variance.
Conclusion: This questionnaire demonstrated sound reliability and validity in Persian, providing an effective means to assess attitude and behavior related to mask usage during highly contagious viral epidemics. It stands as a valuable tool for use in Iran and other countries.
