BIG Pilot Project - Assessment Report - BIG Coalition Namibia

Section 2: Impact Assessmentholds that were present at all three stages of our study,no child had a z-score of below two. This implies nomalnutrition at all. However, this result must betreated with some caution because the number of children,which can be traced throughout the whole yearhas shrunk due to migration. This necessarily increasesthe standard error, when we compare distributionsacross time. However, the clinic collected data forall children below the age of 7 years from 2007 onwards,so we have been able to extend our initial calculations(based on children under 5 only) to includethese older children as well (see below). The graph belowshows how the distribution of weight for age hasbecome more 'normal' over time as the proportion ofmalnourished children fell. The two-sampleKolgmogorov-Smirnov test (to test for significant differencesbetween the distributions of z-scores) confirmsthat the shift across the first six months and over theentire year was statistically significant (at the 95%level) 15 .15 The p-value for the test for differences between waves 1 and 2,and 1 and 3 were 0.019 and 0.015 respectively.54