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Table 2 Change in number of surveys with WHZ SD above 1.2Z over 30 years

From: Change in quality of malnutrition surveys between 1986 and 2015

Date Survey SD > 1.2 WHO SD > 1.2 SMART SD > 1.2 WHO SD > 1.2 SMART Difference
# # # % % WHO-SMART
1986–1996 212 90 39 42.5 18.4 24.1
1997–2003 325 80 17 24.6 5.2 19.4
2003–2007 364 57 17 15.7 4.7 11.0
2007–2015 865 55 16 6.4 1.8 4.5
  1. All survey data except for that contributed by agency “t”. The dates are selected to mark changes in survey methodology. The difference between WHO and SMART flags give the difference in the WHZ SD when all biologically possible values (WHO) and only values statistically likely to be true values (SMART) are included in the dataset. The differences in the data represent the care with which the enumerators measured height and weight and with an error-free survey should tend to zero