Field trial of applicability of lot quality assurance sampling survey method for rapid assessment of prevalence of active trachoma.
Objective To test the applicability of lot quality assurance sampling (LQAS) for the rapid assessment of the prevalence of active trachoma. Methods Prevalence of active trachoma in six communities was found by examining all children aged 2-5 years. Trial surveys were conducted in these communities....
| Publicado en: | Bulletin of the World Health Organization Vol. 81; no. 12; pp. 877 - 886 |
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| Autores principales: | , , , |
| Formato: | research Journal Article |
| Publicado: |
World Health Organization
2003
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=106081044&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 106081044 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00429686 BUW jtl: Bulletin of the World Health Organization issn: 00429686 maglogo: N pubinfo: dt: 2003 vid: 81 iid: 12 pid: 437 pub: World Health Organization artinfo: ui: 106081044 106081044 2009393202 NLM14997240 106081044 ppf: 877 ppct: 9 formats: fmt: @attributes: type: P tig: atl: Field trial of applicability of lot quality assurance sampling survey method for rapid assessment of prevalence of active trachoma. aug: au: Myatt M Limburg H Minassian D Katyola D sug: subj: Quality Assurance Methods Surveys Trachoma Epidemiology Confidence Intervals Data Collection Malawi Prevalence Probability Sample Sensitivity and Specificity Human ab: Objective To test the applicability of lot quality assurance sampling (LQAS) for the rapid assessment of the prevalence of active trachoma. Methods Prevalence of active trachoma in six communities was found by examining all children aged 2-5 years. Trial surveys were conducted in these communities. A sampling plan appropriate for classifying communities with prevalences <=20% and >=40% was applied to the survey data. Operating characteristic and average sample number curves were plotted, and screening test indices were calculated. The ability of LQAS to provide a three-class classification system was investigated. Findings Ninety-six trial surveys were conducted. All communities with prevalences <=20% and >=40% were identified correctly. The method discriminated between communities with prevalences <=30% and >30%, with sensitivity of 98% (95% confidence interval (CI) = 88.2-99.9%), specificity of 84.4% (CI = 69.9-93.0%), positive predictive value of 87.7% (CI = 75.7-94.5%), negative predictive value of 97.4% (CI = 84.9-99.9%), and accuracy of 91.7% (CI = 83.8-96.1%). Agreement between the three prevalence classes and survey classifications was 84.4% (CI = 75.2-90.7%). The time needed to complete the surveys was consistent with the need to complete a survey in one day. Conclusion Lot quality assurance sampling provides a method of classifying communities according to the prevalence of active trachoma. It merits serious consideration as a replacement for the assessment of the prevalence of active trachoma with the currently used trachoma rapid assessment method. It may be extended to provide a multi-class classification method. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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