Table 2. Mean of BAs (in Years) Overall and for Each of Five Groups of Hand-Wrist Bones of Children According to Manual Greulich and Pyle Atlas Method.
| Age | n (M/F) |
Overall BA | Distal Radius and Ulna | Metacarpals | Proximal Phalanges | Middle Phalanges | Distal Phalanges | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Boys | Girls | Boys | Girls | Boys | Girls | Boys | Girls | Boys | Girls | Boys | Girls | ||
| 2–2.99 | 8/16 | 2.80 | 2.50 | 2.63 | 2.30 | 2.52 | 2.26 | 3.32 | 2.78 | 3.89* | 3.17 | 3.14 | 2.57 |
| 3–3.99 | 13/17 | 3.25 | 3.05 | 3.70 | 2.95 | 3.58 | 2.65* | 4.25 | 3.32 | 4.72 | 3.67 | 3.92 | 3.08 |
| 4–4.99 | 22/24 | 4.20 | 4.25 | 4.30 | 3.80 | 4.22 | 3.56 | 4.81 | 4.27 | 5.51 | 4.35 | 4.80 | 3.98 |
| 5–5.99 | 24/24 | 5.55 | 5.30 | 5.07 | 5.50 | 4.73 | 5.26 | 5.79 | 5.89 | 6.58 | 6.41 | 5.60 | 5.54 |
| 6–6.99 | 16/19 | 6.67 | 6.45 | 6.25 | 6.55 | 5.92 | 6.41 | 6.98 | 7.08 | 7.88* | 7.73* | 6.65 | 7.10 |
| 7–7.99 | 18/6 | 7.40 | 7.50 | 6.90 | 6.70 | 6.83 | 6.40 | 7.63 | 8.05 | 8.51 | 8.21* | 7.25 | 8.75 |
| 8–8.99 | 20/12 | 8.65 | 8.5 | 7.72 | 8.42 | 7.62* | 8.08 | 8.16 | 8.96 | 9.16 | 9.56* | 7.85 | 8.62 |
| 9–9.99 | 15/11 | 8.95 | 9.30 | 8.38* | 9.55 | 8.24* | 9.17 | 9.57 | 10.25 | 10.34 | 10.92* | 9.25 | 10.12 |
| 10–10.99 | 16/11 | 10.95* | 10.00 | 10.82 | 9.53 | 10.52 | 9.35* | 11.10* | 10.02 | 12.03* | 10.46 | 10.93 | 9.78 |
| 11–11.99 | 33/19 | 12.35* | 11.25 | 12.50* | 10.65 | 12.25 | 10.32* | 12.42* | 10.87 | 13.04* | 12.02 | 12.60* | 10.85 |
| 12–12.99 | 24/9 | 13.65* | 11.85 | 13.25* | 11.52 | 13.00* | 11.18* | 13.62* | 11.95 | 13.29* | 12.95 | 13.43* | 11.55 |
| 13–13.99 | 20/0 | 13.75 | 13.45 | 13.35 | 13.50 | 14.10 | 13.40 | ||||||
*Indicate significant difference (p < 0.05) between BA and CA. BA = bone age, CA = chronological age