Age (years) | −2 SD | −1 SD | Mean | +1 SD | +2 SD | Sample size | SD | FPI median (±1 SD) | FPI median (±2 SD) | Clinical alert FPI >±2 SD |
3 | 0.02 | 3.60 | 7.19 | 10.78 | 12.78 | 21 | 3.6 | 8 (4–12) | 8 (0–12) | <0 or >12 |
4 | 1.11 | 3.76 | 6.40 | 9.04 | 11.79 | 20 | 2.6 | 6 (3–9) | 6 (0–12) | <0 or >12 |
5 | −2.41 | 0.91 | 4.22 | 7.54 | 10.68 | 55 | 3.3 | 3 (0–6) | 3 (−3 to 9) | < −3 or >9 |
6 | −1.37 | 1.50 | 4.36 | 7.22 | 10.71 | 388 | 2.9 | 4 (1–7) | 4 (−2 to 10) | < −2 or >10 |
7 | −1.53 | 1.40 | 4.32 | 7.24 | 10.67 | 536 | 2.9 | 4 (1–7) | 4 (−2 to 10) | < −2 or >10 |
8 | −1.64 | 1.33 | 4.29 | 7.25 | 10.15 | 473 | 2.9 | 4 (1–7) | 4 (−1 to 10) | < −1 or >10 |
9 | −1.74 | 1.11 | 3.96 | 6.81 | 9.83 | 625 | 2.8 | 4 (1–7) | 4 (−1 to 10) | < −1 or >10 |
10 | −2.31 | 0.73 | 3.77 | 6.81 | 9.92 | 497 | 3.0 | 3 (0–6) | 4 (−3 to 9) | < −3 or >9 |
11 | −1.77 | 1.28 | 4.33 | 7.38 | 10.20 | 377 | 3.0 | 4 (1–7) | 4 (−2 to 10) | < −2 or >10 |
12 | −2.43 | 0.92 | 4.26 | 7.61 | 10.73 | 144 | 3.3 | 4 (1–7) | 4 (−2 to 10) | < −2 or >10 |
13 | −0.03 | 2.71 | 5.45 | 8.19 | 11.18 | 33 | 2.7 | 5 (2–8) | 5 (−1 to 11) | < −1 or >11 |
14 | −3.89 | −0.28 | 3.32 | 6.92 | 9.92 | 22 | 3.6 | 4 (1–7) | 4 (−2 to 9) | < −2 or >9 |
15 | −2.84 | 0.77 | 4.38 | 7.99 | 11.18 | 26 | 3.6 | 4 (0–8) | 4 (−4 to 12) | <−4 or >12 |
FPI, foot posture index.