TABLE 2.
Overview of representative surveys at the national and regional levels that determined hemoglobin and micronutrient status indicators included in the VMNIS of the WHO1
| Preschool children | School children | Women of reproductive age | ||||
|---|---|---|---|---|---|---|
| Surveys, n | Countries, n | Surveys, n | Countries, n | Surveys, n | Countries, n | |
| Hemoglobin | 400 | 127 | 114 | 59 | 251 | 98 |
| Urinary iodine concentration | 13 | 11 | 197 | 110 | 34 | 27 |
| Plasma ferritin | 90 | 63 | 38 | 26 | 33 | 28 |
| Transferrin receptor | 27 | 19 | 9 | 7 | 8 | 8 |
| Plasma zinc | 35 | 27 | 19 | 14 | 9 | 9 |
| Plasma retinol | 112 | 75 | 33 | 25 | 22 | 20 |
| Retinol-binding protein | 28 | 22 | 5 | 4 | 9 | 7 |
1
For the VMNIS, see (14). Number of surveys implemented between 1990 and 2020 included in VMNIS as of 5 May, 2021. VMNIS, Vitamin Mineral Nutrition Information System.