Number of countries according to the existence of sex differences in mean height-for-age z-scores (HAZ) by age group
| Age groups | Lower HAZ among boys | Lower HAZ among girls | ||||
| Total | Significant difference* | Total | Significant difference* | |||
| N | % | N | % | |||
| Total (0–59 months) | 72 | 51 | 72.2 | 15 | 0 | 0.0 |
| 0–11 months | 77 | 30 | 38.9 | 10 | 0 | 0.0 |
| 12–23 months | 78 | 51 | 65.4 | 9 | 0 | 0.0 |
| 24–35 months | 61 | 24 | 39.3 | 26 | 0 | 0.0 |
| 36–47 months | 53 | 11 | 20.7 | 34 | 5 | 14.7 |
| 48–59 months | 37 | 1 | 2.7 | 50 | 9 | 18.0 |
*Statistical significance assessed by linear regression, p<0.05.