| Titre : | A field test of three LQAS designs to assess the prevalence of acute malnutrition. Commentary. (2007) |
| Auteurs : | Megan DEITCHLER ; Kari EGGE ; Soledad Fernandez ; Mary HENNIGAN ; Saul MORRIS, disc. ; Joseph-J VALADEZ |
| Type de document : | Article |
| Dans : | International journal of epidemiology (vol. 36, n° 4, 2007) |
| Pagination : | 858-865 |
| Langues: | Anglais |
| Mots-clés : | Malnutrition ; Contrôle qualité ; Epidémiologie ; Prévalence ; Ethiopie ; Enfant ; Afrique ; Homme ; Maladie nutrition |
| Résumé : | [BDSP. Notice produite par INIST-CNRS 9kaRR0xu. Diffusion soumise à autorisation]. Background The conventional method for assessing the prevalence of Global Acute Malnutrition (GAM) in emergency settings is the 30 x 30 cluster-survey. This study describes alternative approaches : three Lot Quality Assurance Sampling (LQAS) designs to assess GAM. The LQAS designs were field-tested and their results compared with those from a 30 x 30 cluster-survey. Methods Computer simulations confirmed that small clusters instead of a simple random sample could be used for LQAS assessments of GAM. Three LQAS designs were developed (33 x 6,67 x 3, Sequential design) to assess GAM thresholds of 10,15 and 20%. The designs were field-tested simultaneously with a 30 x 30 cluster-survey in Siraro, Ethiopia during June 2003. Using a nested study design, anthropometric, morbidity and vaccination data were collected on all children 6-59 months in sampled households. Hypothesis tests about GAM thresholds were conducted for each LQAS design. Point estimates were obtained for the 30 x 30 cluster-survey and the 33 x 6 and 67 x 3 LQAS designs. Results Hypothesis tests showed GAM as<10% for the 33x6 design and GAM as>=10% for the 67 x 3 and Sequential designs. Point estimates for the 33 x 6 and 67 x 3 designs were similar to those of the 30 x 30 cluster-survey for GAM (6.7%, CI=3.2-10.2% ; 8.2%, CI=4.3-12.1%, 7.4%, CI=4.8-9.9%) and all other indicators. The CIs for the LQAS designs were only slightly wider than the CIs for the 30 x 30 cluster-survey ; yet the LQAS designs required substantially less time to administer. Conclusions The LQAS designs provide statistically appropriate alternatives to the more time-consuming 30 x 30 cluster-survey. However, additional field-testing is needed using independent samples rather than a nested study design. |
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