FIELD GUIDE ON RAPID NUTRITIONAL ASSESSMENT IN EMERGENCIES Data Analysis Presented by: Dr. SANA ABDELRAHIM
Analysis of Anthropometric Data:
Survey results can be analyzed by, either: Hand tabulation, or Portable computer i.e laptop. In either cases, the wt for ht curves of the WHO reference are needed for the interpretation. In hand tabulation data analyzed by using CDCWHO normalize reference table of wt for ht. After that data should be sent for computer analysis. By computer, Epi-Info version 5 is used in analysis.
Recommended Format For DA:
Prevalence of acute malnutrion: It is the sum of the prevalence of children – 2 Z scores & prevalence of edema cases – 2 Z score or more. Mean Z score & Sd: the using of comp. software allow calculation of Z score for each child. Shift to the left underlines the fact that relieve measures should be directed to the total population.
No. of subjects
% with edema
WfH <-2 Z scores
<85 cm >85 cm Total
Minimum table for hand analysis
No. of subjects
Prevalence WfH . <3 Zscores
<-2 Zscores, >3 Z scores
Total WfH prevalence <2 Z- scores
Mean of WfH Zscores
<24 months or < 85 cm
>24 months or >85
More detailed table
Sd of WfH Z-scores
Interpretation Of Results:
% WfH<-2 The table which has Z score been developed for children 6-59 months of age or 60 – 100 cm <5 in length. 5-9.9
Interpretatio n Acceptable Poor
10 – 14.9
Report Outline: 1. 2. 3.
The report should be brief but include all information. The following format is proposed for the report: Area where the survey was held: Size & geographical character. Population present & before emergency. Administrative area. Character of area before the emergency Kind of population in affected area Type of emergency: Main changes brought about by emergency: Change in food availability. Outbreak of diseases. Availability & functioning oh health services.
Report Outline (cont’d): Availability of schools. Water & sanitation. Functioning of administrative infrastructure. 4. Survey subjects. 5. Sample size & sampling methods. 6. No. of subgroups analyzed. 7. Indicators & cutoff point used. 8. Findings: Table of prevalence & mean Z scores, including confidence intervals & Sd of mean Z score. Distribution curves of Z score comparing survey results to the reference distribution. 9. Interpretation of findings. 10.Conclusions & recommendations for action.
Major generalized downword shift for entire Weightfor-height distribution
20 Reference Malnourished population %
Weight-for-height distribution â€“ Z- scores