Validity and Reliability of the Glaucoma Knowledge Level Questionnaire
Objectives: The present study was conducted to develop an instrument for measuring adults’ glaucoma knowledge levels and to establish the instrument’s validity and reliability. Materials and Methods: The study group consisted of 811 persons aged 40-80 years who presented to primary health care...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Galenos Yayinevi
2018-06-01
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| Series: | Türk Oftalmoloji Dergisi |
| Subjects: | |
| Online Access: | http://www.oftalmoloji.org/archives/archive-detail/article-preview/validity-and-reliability-of-the-glaucoma-knowledge/19066 |
| _version_ | 1797912223958433792 |
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| author | Zeynep Demirtaş Gökçe Dağtekin Muhammed Fatih Önsüz Aziz Soysal Nilgün Yıldırım Selma Metintaş |
| author_facet | Zeynep Demirtaş Gökçe Dağtekin Muhammed Fatih Önsüz Aziz Soysal Nilgün Yıldırım Selma Metintaş |
| author_sort | Zeynep Demirtaş |
| collection | DOAJ |
| description | Objectives:
The present study was conducted to develop an instrument for measuring adults’ glaucoma knowledge levels and to establish the instrument’s validity and reliability.
Materials and Methods:
The study group consisted of 811 persons aged 40-80 years who presented to primary health care institutions and did not have a glaucoma diagnosis. A 27-item questionnaire measuring level of glaucoma knowledge was created by the study team. Following expert consultation, it was structurally evaluated. The difficulty index and discrimination index were calculated for each item. Factor analysis was used to determine construct validity, Cronbach’s alpha internal consistency coefficient and item-total correlations were calculated to determine reliability. Confirmatory factor analysis was used to assess the extent to which the factor structure of the scale fit. We analysed correlation with the National Eye Health Education Program (NEHEP) Eye-Q scale in order to evaluate the validity of the scale.
Results:
The final glaucoma knowledge level questionnaire comprised 10 items in one dimension. The discrimination index and difficulty index ranged between 0.28 to 0.65 and 33 to 61%, respectively. According to factor analysis, the Kaiser-Meyer-Olkin score was 0.760 and Bartlett’s test indicated p<0.001. Confirmatory factor analysis showed acceptable scale fit and fit indices. Validity assessment revealed a positive correlation between the total score of the items of the NEHEP scale and glaucoma knowledge level questionnaire score (r=0.522; p<0.001). Scores were higher in participants who were aged 40-64, living in the city, had education level of high school or above and had previous eye examination or intraocular pressure measurement.
Conclusion:
The glaucoma knowledge level questionnaire has the distinction of being the first valid and reliable scale for assessing level of glaucoma knowledge in Turkey. |
| first_indexed | 2024-04-10T11:53:02Z |
| format | Article |
| id | doaj.art-cf089cf9de0b43409af2ad6651b451a2 |
| institution | Directory Open Access Journal |
| issn | 1300-0659 2147-2661 |
| language | English |
| last_indexed | 2024-04-10T11:53:02Z |
| publishDate | 2018-06-01 |
| publisher | Galenos Yayinevi |
| record_format | Article |
| series | Türk Oftalmoloji Dergisi |
| spelling | doaj.art-cf089cf9de0b43409af2ad6651b451a22023-02-15T16:17:01ZengGalenos YayineviTürk Oftalmoloji Dergisi1300-06592147-26612018-06-0148311512110.4274/tjo.26576Validity and Reliability of the Glaucoma Knowledge Level QuestionnaireZeynep Demirtaş0Gökçe Dağtekin1Muhammed Fatih Önsüz2Aziz Soysal3Nilgün Yıldırım4Selma Metintaş5Eskişehir Osmangazi University Faculty of Medicine, Department of Public Health, Eskişehir, TurkeyEskişehir Osmangazi University Faculty of Medicine, Department of Public Health, Eskişehir, TurkeyEskişehir Osmangazi University Faculty of Medicine, Department of Public Health, Eskişehir, TurkeyEskişehir Osmangazi University Faculty of Medicine, Department of Public Health, Eskişehir, TurkeyEskişehir Osmangazi University Faculty of Medicine, Department of Ophthalmology, Eskişehir, TurkeyEskişehir Osmangazi University Faculty of Medicine, Department of Public Health, Eskişehir, TurkeyObjectives: The present study was conducted to develop an instrument for measuring adults’ glaucoma knowledge levels and to establish the instrument’s validity and reliability. Materials and Methods: The study group consisted of 811 persons aged 40-80 years who presented to primary health care institutions and did not have a glaucoma diagnosis. A 27-item questionnaire measuring level of glaucoma knowledge was created by the study team. Following expert consultation, it was structurally evaluated. The difficulty index and discrimination index were calculated for each item. Factor analysis was used to determine construct validity, Cronbach’s alpha internal consistency coefficient and item-total correlations were calculated to determine reliability. Confirmatory factor analysis was used to assess the extent to which the factor structure of the scale fit. We analysed correlation with the National Eye Health Education Program (NEHEP) Eye-Q scale in order to evaluate the validity of the scale. Results: The final glaucoma knowledge level questionnaire comprised 10 items in one dimension. The discrimination index and difficulty index ranged between 0.28 to 0.65 and 33 to 61%, respectively. According to factor analysis, the Kaiser-Meyer-Olkin score was 0.760 and Bartlett’s test indicated p<0.001. Confirmatory factor analysis showed acceptable scale fit and fit indices. Validity assessment revealed a positive correlation between the total score of the items of the NEHEP scale and glaucoma knowledge level questionnaire score (r=0.522; p<0.001). Scores were higher in participants who were aged 40-64, living in the city, had education level of high school or above and had previous eye examination or intraocular pressure measurement. Conclusion: The glaucoma knowledge level questionnaire has the distinction of being the first valid and reliable scale for assessing level of glaucoma knowledge in Turkey.http://www.oftalmoloji.org/archives/archive-detail/article-preview/validity-and-reliability-of-the-glaucoma-knowledge/19066Glaucomalevel of knowledgescale development |
| spellingShingle | Zeynep Demirtaş Gökçe Dağtekin Muhammed Fatih Önsüz Aziz Soysal Nilgün Yıldırım Selma Metintaş Validity and Reliability of the Glaucoma Knowledge Level Questionnaire Türk Oftalmoloji Dergisi Glaucoma level of knowledge scale development |
| title | Validity and Reliability of the Glaucoma Knowledge Level Questionnaire |
| title_full | Validity and Reliability of the Glaucoma Knowledge Level Questionnaire |
| title_fullStr | Validity and Reliability of the Glaucoma Knowledge Level Questionnaire |
| title_full_unstemmed | Validity and Reliability of the Glaucoma Knowledge Level Questionnaire |
| title_short | Validity and Reliability of the Glaucoma Knowledge Level Questionnaire |
| title_sort | validity and reliability of the glaucoma knowledge level questionnaire |
| topic | Glaucoma level of knowledge scale development |
| url | http://www.oftalmoloji.org/archives/archive-detail/article-preview/validity-and-reliability-of-the-glaucoma-knowledge/19066 |
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