Table 2.
Accuracy assessment of GP method for bone age assessment to predict chronological age.
| Age groups | Cases | CA median (IQR) | BA median (IQR) | BA–CA difference, median | Wilcoxon matched pairs test | AE median (IQR) | APE median (IQR) |
|---|---|---|---|---|---|---|---|
| 9.0–9.9 | 7 | 9.7 (9.4–9.7) | 8.5 (7.0–8.5) | −1.2 | Z −1.35, p 0.176 | 1.5 (0.67–2.67) | 15.5% (7.1–27) |
| 10.0–10.9 | 10 | 10.5 (10.4–10.6) | 10.0 (8.4–11.3) | −0.5 | Z −1.17, p 0.241 | 1.6 (0.7–2.8) | 15.6% (6.4–26) |
| 11.0–11.9 | 30 | 11.5 (11–11.7) | 10.9 (9.9–12.3) | −0.6 | Z −1.24, p 0.214 | 1.2 (0.7–2.6) | 10.1% (6.4–22) |
| 12.0–12.9 | 25 | 12.0 (12–12.3) | 12.0 (10.7–13.1) | 0 | Z −0.97, p 0.331 | 1.1 (0.8–2.3) | 8.7% (6.2–19) |
| 13.0–13.9 | 20 | 13.4 (13–13.6) | 12.8 (11.1–13.6) | −0.6 | Z −2.05, p 0.04 | 1.2 (0.5–3.1) | 9.2% (3.8–24) |
| 14.0–14.9 | 18 | 14.5 (14.1–14.7) | 14.0 (13.2–15.1) | −0.5 | Z −1.16, p 0.246 | 1.0 (0.5–1.4) | 6.6% (3.4–10) |
| 15.0–15.9 | 28 | 15.4 (15.0–15.7) | 15.0 (14.3–16.0) | −0.4 | Z −1.22, p 0.222 | 0.7 (0.6–1.1) | 4.7% (4.6–7.3) |
| 16.0–16.9 | 18 | 16.5 (16.4–16.7) | 16.0 (15.3–17.5) | −0.5 | Z −1.22, p 0.255 | 1.1 (0.5–1.6) | 6.5% (3.0–10) |
| 17.0–17.9 | 15 | 17.3 (17.0–17.7) | 16.5 (15.5–17.5) | −0.8 | Z −2.03, p 0.043 | 1.1 (0.5–1.9) | 6.2% (3.0–11) |
| 18.0–18.9 | 11 | 18.0 (18.0–18.0) | 16.5 (15.5–18.0) | −1.5 | Z −2.11, p 0.035 | 1.5 (0.0–2.5) | 8.3% (0–14%) |
All units are in years to 1 decimal point except last column on the right,.
AE, absolute error; APE, absolute percentage error.