Table 2. Median and selected percentiles of serum ferritin concentrations for children aged 6–17 years in China in 2016–2017 (ng/mL).
| Age group (years) | P2.5 | P5 | P10 | P25 | P50 | P75 | P90 | P95 | P97.5 |
| Total | |||||||||
| 6–17 | |||||||||
| Total | 9.8 | 15.2 | 23.4 | 38.7 | 59.9 | 89.6 | 131.8 | 166.3 | 203.9 |
| Male | 17.9 | 23.1 | 30.3 | 45.0 | 66.5 | 100.3 | 147.7 | 188.3 | 225.7 |
| Female | 7.0 | 10.3 | 16.9 | 32.2 | 52.5 | 79.2 | 112.4 | 137.3 | 165.4 |
| 6–11 | |||||||||
| Subtotal | 19.1 | 24.0 | 30.5 | 43.1 | 61.4 | 86.1 | 119.3 | 146.1 | 179.4 |
| Male | 19.3 | 24.1 | 30.5 | 43.3 | 61.2 | 84.9 | 119.7 | 148.2 | 187.8 |
| Female | 18.8 | 23.9 | 30.4 | 43.0 | 61.7 | 87.2 | 118.7 | 142.6 | 171.0 |
| 12–17 | |||||||||
| Subtotal | 7.2 | 10.7 | 17.1 | 33.4 | 58.0 | 93.9 | 144.1 | 181.2 | 221.8 |
| Male | 16.7 | 21.8 | 30.1 | 47.6 | 75.1 | 118.2 | 171.5 | 212.7 | 251.8 |
| Female | 5.2 | 7.3 | 11.0 | 22.7 | 42.7 | 68.9 | 102.7 | 131.2 | 160.6 |
| Urban | |||||||||
| 6–17 | |||||||||
| Total | 9.2 | 14.5 | 22.5 | 38.3 | 61.4 | 95.5 | 141.0 | 181.0 | 220.7 |
| Male | 17.6 | 22.8 | 30.3 | 45.6 | 69.5 | 108.2 | 159.1 | 206.1 | 246.3 |
| Female | 6.5 | 9.7 | 15.6 | 31.2 | 52.7 | 81.4 | 118.6 | 146.2 | 177.8 |
| 6–11 | |||||||||
| Subtotal | 18.2 | 23.4 | 30.0 | 43.3 | 63.1 | 90.8 | 125.9 | 158.7 | 197.5 |
| Male | 18.5 | 23.5 | 30.5 | 43.3 | 62.4 | 91.0 | 127.6 | 168.7 | 206.1 |
| Female | 17.8 | 23.3 | 29.6 | 43.2 | 63.6 | 90.8 | 125.0 | 153.3 | 189.1 |
| 12–17 | |||||||||
| Subtotal | 7.0 | 10.7 | 17.2 | 33.7 | 59.6 | 100.1 | 152.3 | 193.5 | 236.1 |
| Male | 16.8 | 22.3 | 30.3 | 48.5 | 79.6 | 124.8 | 181.0 | 224.7 | 262.5 |
| Female | 5.2 | 7.1 | 11.2 | 22.9 | 43.5 | 71.4 | 111.6 | 142.0 | 170.4 |
| Rural | |||||||||
| 6–17 | |||||||||
| Total | 10.5 | 16.0 | 24.0 | 39.1 | 58.9 | 85.1 | 122.6 | 153.0 | 184.4 |
| Male | 18.1 | 23.4 | 30.3 | 44.4 | 64.3 | 93.1 | 138.3 | 172.9 | 205.2 |
| Female | 7.4 | 10.8 | 17.9 | 33.2 | 52.4 | 76.9 | 105.9 | 129.0 | 152.5 |
| 6–11 | |||||||||
| Subtotal | 19.9 | 24.5 | 30.8 | 43.0 | 60.1 | 83.5 | 113.8 | 138.6 | 166.7 |
| Male | 20.1 | 24.5 | 30.5 | 43.3 | 60.1 | 81.9 | 114.4 | 140.5 | 168.9 |
| Female | 19.7 | 24.5 | 31.1 | 42.7 | 60.1 | 85.0 | 113.6 | 136.8 | 161.4 |
| 12–17 | |||||||||
| Subtotal | 7.4 | 10.7 | 17.1 | 33.2 | 56.4 | 88.1 | 134.5 | 171.6 | 206.1 |
| Male | 16.3 | 21.4 | 29.8 | 46.7 | 71.6 | 109.6 | 161.1 | 198.4 | 231.6 |
| Female | 5.2 | 7.4 | 10.8 | 22.4 | 41.9 | 66.3 | 95.4 | 118.0 | 141.5 |