Table 1.
Number of households, response rate, number of children and time of field work by survey year
| Survey year | |||||
|---|---|---|---|---|---|
| 1996 | 2001 | 2006 | 2011 | 2016 | |
| Total households (N) | 8082 | 8602 | 8707 | 10,826 | 11,490 |
| Response rate (%) | 99.6 | 99.6 | 99.6 | 99.4 | 98.5 |
| Total childrena (N) | 3734 | 6367 | 5417 | 2430 | 2446 |
| Total childrenb (weighted N) | 3703 | 6442 | 5258 | 2485 | 2421 |
| Total childrenc (weighted N) | 2967 | NA | NA | NA | 1588 |
| Time of field work | Jan-Jun 1996 | Jan-Jun 2001 | Feb-Aug 2006 | Jan-Jun 2011 | Jun 2016 – Jan 2017 |
aIn 1996 anthropometric data were collected for under-three years old children; in 2001, 2006, 2011 and 2016 anthropometric data were collected for under-five years old children
bSample size used for calculating the quintile specific trends, concentration curves, levels and trends in concentration indices and absolute and relative differences
cSample size used for decomposition analysis to explain between-year changes in inequalities comparing 1996 and 2016
NA: Not applicable