Characteristics of participating children in the national survey in 2014
| Variables | N (%) | ||
| Boys (n=106 857) | Girls (n=106 938) | Both (n=213 795) | |
| Age (years) | |||
| 7 | 8944 (8.37) | 8942 (8.36) | 17 886 (8.37) |
| 8 | 8903 (8.33) | 8929 (8.35) | 17 832 (8.34) |
| 9 | 8962 (8.39) | 8980 (8.40) | 17 942 (8.39) |
| 10 | 8972 (8.40) | 8967 (8.39) | 17 939 (8.39) |
| 11 | 8982 (8.41) | 8937 (8.36) | 17 919 (8.38) |
| 12 | 8953 (8.38) | 8951 (8.37) | 17 904 (8.37) |
| 13 | 8968 (8.39) | 8982 (8.40) | 17 950 (8.40) |
| 14 | 8964 (8.39) | 8969 (8.39) | 17 933 (8.39) |
| 15 | 8973 (8.40) | 8987 (8.40) | 17 960 (8.40) |
| 16 | 8960 (8.39) | 8967 (8.39) | 17 927 (8.39) |
| 17 | 8952 (8.38) | 8980 (8.40) | 17 932 (8.39) |
| 18 | 8324 (7.79) | 8347 (7.81) | 16 671 (7.80) |
| Residence | |||
| Urban | 53 502 (50.07) | 53 537 (50.06) | 107 039 (50.07) |
| Rural | 53 355 (49.93) | 53 401 (49.94) | 106 756 (49.93) |
| Socioeconomic development | |||
| Developed | 35 567 (33.28) | 35 704 (33.39) | 71 271 (33.34) |
| Intermediately developed | 35 659 (33.37) | 35 620 (33.31) | 71 279 (33.34) |
| Under-developed | 35 631 (33.34) | 35 614 (33.30) | 71 245 (33.32) |