| Participants (No. = 33,150) | |
---|---|---|
no | % | |
Age(Y) | ||
  < 9 | 21,989 | 66.3 |
  ≥ 9 | 11,161 | 33.7 |
Sex | ||
 Male | 17,143 | 51.7 |
 Female | 16,007 | 48.3 |
Residence | ||
 Urban | 18,858 | 56.9 |
 Rural | 14,292 | 43.1 |
SES | ||
 Low | 4315 | 13.1 |
 Moderate | 24,970 | 75.3 |
 High | 3865 | 11.6 |