TABLE 1—
Iron Status Indicators and Diagnostic Categories of Anemia and Iron Deficiency Among Rural Amazonians, by Age: Brazil, 2004
| School Children, 5–11 y | Adolescents, 12–14 y | Men, ≥ 15 y | Women, ≥ 15 y | All Age Groups | |
| Hemoglobin (g/L)a | |||||
| Median (IQR) | 126 (116–135) | 131 (125–144) | 148 (138–158) | 133 (121–145) | 137 (125–150) |
| Proportion below cut-off, % (95% CI) | 20.5 (13.2, 30.4) | 15.8 (7.5, 30.5) | 9.0 (5.4,14.8) | 21.1 (14.9, 29.2) | 16.0 (12.7, 20.0) |
| SF (μg/L)b | |||||
| Median (IQR) | 43.0 (30.0–75.5) | 55.0 (38.5–73.2) | 111.0 (56.5–179.5) | 54.0 (33.5–105.5) | 63.0 (39.0–122.0) |
| Proportion < 15 μg/L, % (95% CI) | 2.5 (0.8, 8.5) | 2.8 (0.7, 14.2) | 0 | 7.4 (3.6, 13.0) | 3.2 (1.8, 5.4) |
| Proportion < 30 μg/L, % (95% CI) | 25.9 (17.6, 36.4) | 8.3 (3.0, 21.9) | 5.7 (2.9, 10.8) | 19.0 (13.0, 26.9) | 14.5 (11.3, 18.4) |
| sTfR (mg/L)b | |||||
| Median (IQR) | 5.7 (4.5–7.2) | 4.9 (3.8–5.9) | 4.9 (4.0–5.8) | 4.6 (3.9–6.2) | 5.0 (4.0–6.2) |
| Proportion > 8.3 mg/L, % (95% CI) | 13.6 (7.8, 22.7) | 2.8 (0.6, 14.2) | 4.2 (2.0, 9.0) | 7.4 (4.0, 13.5) | 7.1 (4.9, 10.2) |
| Proportion in each diagnostic category, % (95% CI) | |||||
| Iron sufficiencyb,c | 64.2 (53.3, 73.8) | 88.9 (74.6, 95.5) | 91.5 (85.7, 95.0) | 77.7 (69.5, 84.2) | 81.0 (76.7, 84.6) |
| Possible IDb,d | 29.6 (20.8, 40.4) | 8.3 (3.0, 21.9) | 7.1 (3.9, 12.6) | 14.0 (9.0, 21.4) | 14.2 (11.1, 18.1) |
| Probable IDb,e | 6.2 (2.7, 13.7) | 2.8 (0.7, 14.2) | 1.4 (0.4, 5.0) | 5.0 (2.3, 10.4) | 3.7 (2.2, 6.1) |
| Definite IDb,f | 0 | 0 | 0 | 3.3 (1.3, 8.2) | 1.1 (0.4, 2.7) |
| ID anemiag | 10.0 (5.2, 18.5) | 2.8 (0.7, 14.2) | 0.7 (0.2, 3.9) | 9.1 (5.2, 15.6) | 5.6 (3.7, 8.4) |
| No. of participants with ID anemia/total no. of anemic participants (%) | 8/16 (50.0%) | 1/5 (20.0%) | 1/12 (8.3%) | 11/23 (47.8%) | 21/56 (37.5%) |
Note. CI = confidence interval; ID = iron deficiency; IQR = interquartile range; SF = serum ferritin; sTfR = soluble transferrin receptor.
a Results available for 83 children, 38 adolescents, 144 men, and 123 women (total, n = 388).
b Results available for 81 children, 36 adolescents, 141 men, and 121 women (total, n = 379).
c Iron sufficiency: SF ≥ 30 μg/L and sTfR ≤ 8.3 mg/L.
d Possible ID: SF 15–30 μg/L and sTfR ≤ 8.3 mg/L, or SF ≥ 30 μg/L and sTfR > 8.3 mg/L.
e Probable ID: SF = 15–30 μg/L and sTfR > 8.3 mg/L, or SF < 15 μg/L and sTfR ≤ 8.3 mg/L.
f Definite ID: SF < 15 μg/L and sTfR > 8.3 mg/L.
g ID anemia = hemoglobin below WHO cut-off value for age and gender plus any evidence of ID (SF < 30 μg/L or sTfR > 8.3 mg/L). Results available for 80 children, 36 adolescents, 140 men, and 121 women (total, n = 377).