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