Table 5. Haematological characteristics according to iron sufficiency, iron depletion and IDa.
| Iron sufficiency | Iron depletion | ID | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Boys (n=344)b | Girls (n=361)b | Total (n=705)b | Boysc (n=63)b | Girls (n=104)b | Total (n=167)b | Boys (n=18)b | Girls (n=27)b | Total (n=45)b | |
| Mean Hb, g/dl (s.d.) | 14.9 (1.2) | 13.6 (0.9) | 14.2 (1.2)* | 14.4 (1.0) | 13.3 (1.6) | 13.7 (1.4) | 13.7 (0.9) | 12.0 (1.4) | 12.7 (1.4) |
| Mean RBC, 1012/l (s.d.) | 5.2 (0.4) | 4.7 (0.3) | 4.9 (0.4) | 5.2 (0.4) | 4.7 (0.5) | 4.8 (0.5) | 5.0 (0.4) | 4.8 (0.3) | 4.8 (0.4) |
| Mean MCV, fl (s.d.) | 84.1 (4.4) | 85.7 (4.6) | 84.8 (4.5)* | 82.1 (4.6) | 84.5 (4.5) | 83.4 (4.7) | 82.0 (4.2) | 78.2 (8.0) | 80.1 (6.4) |
| Mean MCH, pg (s.d.) | 28.8 (1.8) | 29.0 (1.8) | 28.8 (1.8)* | 28.0 (1.9) | 28.3 (1.8) | 28.3 (1.9) | 27.6 (1.7) | 25.1 (3.5) | 26.3 (2.9) |
| Mean MCHC, g/dl (s.d.) | 34.3 (1.0) | 33.8 (0.9) | 34.1 (0.9)* | 34.1 (1.0) | 33.5 (0.9) | 33.7 (1.0) | 33.6 (1.0) | 32.0 (1.8) | 32.8 (1.6) |
| Mean RDW, % (s.d.) | 12.9 (0.9) | 12.7 (0.9) | 12.8 (0.9)* | 13.2 (1.0) | 13.2 (1.0) | 13.2 (1.0) | 13.6 (0.9) | 14.6 (2.0) | 14.1 (1.6) |
Abbreviations: Hb, haemoglobin; ID, iron deficiency; MCH, mean corpuscular haemoglobin; MCHC, mean corpuscular haemoglobin concentration; MCV, mean corpuscular volume; RBC, red blood cells; RDW, red cell distribution width.
a
All data were adjusted by a weighing factor to balance the sample according to the theoretical age distribution of the European adolescent population.
b
The count of subjects (n) are reported in the table as unweighted values.
*P<0.001 statistically different between iron sufficiency, iron depletion and ID.