Table 2. Iron biomarkers according to demographic variables.
| Variable | Serum Ferritin ng/ml | P value | Serum transferrin receptor nmol/l | P value | Serum Iron μmol/l | P value |
|---|---|---|---|---|---|---|
| N Median (IQR) |
N Median (IQR) |
N Median (IQR) |
||||
| Gender | ||||||
| Boys | 2876 41.69 (25.25–59.83) |
<0.001 | 2880 25.74 (21.90–30.50) |
<0.001 | 2700 17.61 (14.01–21.19) |
<0.001 |
| Girls | 2885 26.63 (13.82–38.88) |
2914 25.02 (20.12–30.67) |
2830 14.14 (10-.28–18.13) |
|||
| Age | ||||||
| ≥16 | 3343 33.44 (19.38–54.10) |
<0.001 | 3367 24.72 (20.30–29.93) |
<0.001 | 3206 16.38 (12.36–20.51) |
<0.001 |
| <16 | 2304 31.07 (18.59–45.95) |
2303 26.66 (21.68–31.99) |
2209 15.71 (11.67–19.20) |
|||
| Ethnicity | ||||||
| Sinhalese | 3697 33.04 (19.52–51.40) |
<0.001 | 3723 25.41 (20.88–30.67) |
<0.001 | 3589 16.90 (12.67–20.69) |
<0.001 |
| Muslim | 595 35.35 (18.51–57.26) |
602 23.67 (19.82–27.48) |
555 16.50 (11.64–19.19) |
|||
| Tamil | 1469 29.12 (17.73–45.25) |
1468 26.04 (21.32–32.26) |
1387 14.91 (11.18–18.50) |
|||
| Altitude (m) | ||||||
| <500 | 4818 32.87 (19.52–51.29) |
0.003 | 4840 25.43 (20.73–30.99) |
0.311 | 4652 16.17 (12.25–19.76) |
0.003 |
| 500–1000 | 693 31.29 (16.58–46.87) |
703 25.07 (21.14–29.55) |
648 17.09 (10.80–21.14) |
|||
| >1000 | 250 33.21 (25.15–51.68) |
250 26.77 (22.98–30.67) |
230 16.07 (10.57–19.22) |
|||
| Overall |
5761 32.68 (19.35–51.29) |
5794 25.30 (20.91–30.58) |
5530 16.25 (12.19–19.97) |