# Calculation of MAM children from 6-23 months age group

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### Muhammad Khan

District Nutrition Coordinator-Merlin

Normal user

3 May 2015, 19:13

### Mark Myatt

Frequent user

4 May 2015, 07:58

```
case load = N * P * K * C
```

where:
**N**is the size of the population in the program area. An appropriate value for N is usually derived from census data.

**P**is estimated prevalence. This is usually estimated using a nutritional anthropometry survey (e.g. a SMART survey). It is important that prevalence is estimated for the program's admitting case-definition.

**K**is a correction factor to account for new (incident cases) over a given time period. This is usually taken to be 2.6 over one year.

**C**is the expected mean program coverage over a given time period. You have an indirect estimate but this is a clear overestimate. You could correct what you have by divining by K (above). If you have an indirect estimate of coverage of 120% then you might use:

```
C = 120 / 2.6 = 46% = 0.46 (as a proportion)
```

If we assume:
```
Population (N) = 10,501
Prevalence (P) = 8.7% = 0.087 (as a proportion)
Correction (K) = 2.6
Expected coverage (C) = 46% = 0.46 (as a proportion)
```

We get a one-year case-load of:
```
case load = N * P * K * C
case load = 10501 * 0.087 * 2.6 * 0.46
case-load = 1093
```

You can use the 95% CI on P to get a nominal 95% CI on the case-load.
I hope this is of some use.
The material presented in response is based on:
Garenne M, Willie D, Maire B, Fontaine O, Eeckels R, Briend A, Van den Broeck J, Incidence and duration of severe wasting in two African populations, Public Health Nutr. 2009 Nov;12(11):1974-82
Anon, WHO, UNICEF, WFP and UNHCR Consultation on the Programmatic Aspects of the Management of Moderate Acute Malnutrition in Children under five years of age 24-26 February 2010, WHO, Geneva, 2010
MacMahon B, Pugh TF, Epidemiology Principles and Methods, Little Brown & Company, Boston, USA, 1970
Miettinen O, Estimability and estimation in case-referent studies, American Journal of Epidemiology, 1976;103(2):226–235