Table 3.
Annual height increment (cm) by age in children with XLH compared to healthy reference range
| Girls | Boys | |||||
|---|---|---|---|---|---|---|
| Age, years | Normal Reference, cm/year (14–16) | XLH Median Annual Height Increment, cm | Difference (Normal–XLH) | Normal Reference, cm/year (14–16) | XLH Median Annual Height Increment, cm | Difference (Normal–XLH) |
| Birth | 50a | 50a | 0 | 50a | 50a | 0 |
| 0–1 | 25 | 21.5 | 3.5 | 25 | 22.5 | 2.5 |
| 1–2 | 10 | 8.7 | 1.3 | 10 | 8.0 | 2 |
| 2–3 | 8.6 | 6.9 | 1.7 | 8.3 | 6.7 | 1.6 |
| 3–4 | 7.6 | 6.4 | 1.2 | 7.4 | 6.1 | 1.3 |
| 4–5 | 6.8 | 6.6 | 0.2 | 6.8 | 5.8 | 1 |
| 5–6 | 6.7 | 6.3 | 0.4 | 6.8 | 5.9 | 0.9 |
| 6–7 | 6.4 | 5.9 | 0.5 | 6.4 | 5.6 | 0.8 |
| 7–8 | 6.1 | 5.5 | 0.6 | 6.0 | 5.4 | 0.6 |
| 8–9 | 5.9 | 5.3 | 0.6 | 5.7 | 5.3 | 0.4 |
| 9–10 | 6.2 | 5.5 | 0.7 | 5.5 | 5.2 | 0.3 |
| 10–11 | 6.6 | 5.5 | 1.1 | 5.5 | 5.4 | 0.1 |
| 11–12 | 6.3 | 5.3 | 1 | 6.1 | 5.7 | 0.4 |
| 12–13 | 4.8 | 4.9 | -0.1 | 7.1 | 5.7 | 1.4 |
Abbreviation: XLH, X-linked hypophosphatemia.
a Data are reported for length at birth. All data are presented as median values.