Table 2. Haemoglobin, red blood and iron status parameters in European adolescentsa.
| Parameter | Boys (n=438)b | Girls (n=502)b | |||||||
|---|---|---|---|---|---|---|---|---|---|
| M | s.d. | Me | 25–75th percentiles | M | s.d. | Me | 25–75th percentiles | ||
| Hb | g/dl | 14.7 | 1.2 | 14.7 | 14.0–15.6 | 13.8 | 1.2 | 13.4 | 12.8–14.1 |
| RBC | 1012/l | 5.2 | 0.4 | 5.1 | 4.9–5.4 | 4.7 | 0.4 | 4.7 | 4.5–4.9 |
| MCV | fl | 83.6 | 4.6 | 84.0 | 81.5–86.2 | 84.9 | 5.1 | 85.5 | 82.4–88.2 |
| MCH | pg | 28.6 | 1.9 | 28.8 | 27.7–29.8 | 28.6 | 2.1 | 29.0 | 29.0–30.0 |
| MCHC | g/dl | 34.3 | 1.0 | 34.2 | 33.6–34.9 | 33.7 | 1.0 | 33.7 | 33.7–34.3 |
| RDW | % | 12.9 | 0.9 | 12.9 | 12.5–13.3 | 12.9 | 1.1 | 12.8 | 12.8–13.4 |
| SF | μg/l | 36.6* | 23.9 | 32.0 | 17.9–49.3 | 27.9 | 19.7 | 24.1 | 24.1–38.0 |
| STfR | mg/l | 5.9 | 1.9 | 5.8 | 4.6–7.0 | 6.0 | 3.3 | 5.7 | 5.7–7.0 |
Abbreviations: Hb, haemoglobin; M, mean; Me, median; MCH, mean corpuscular haemoglobin; MCHC, mean corpuscular haemoglobin concentration; MCV, mean corpuscular volume; RBC, red blood cells; RDW, red cell distribution width; SF, serum ferritin; sTfR, soluble transferrin receptor.
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.
The data are presented as M, s.d., Me and 25th and 75th percentiles
*P<0.05 statistically significant difference between mean values in boys and girls.