Table 1.
Baseline characteristics of 40 Prader‐Willi syndrome males
| Genetic defect, n (%) | |
| Deletion | 21 (52.5) |
| Uniparental disomy | 6 (15.0) |
| Imprinting centre defect | 3 (7.5) |
| Translocation | 1 (2.5) |
| Not known | 9 (22.5) |
| Cryptorchidism at presentation, n (%) | 35 (87.5) |
| None | 5 (12.5) |
| Bilateral cryptorchid | 27 (67.5) |
| Lt cryptorchid | 2 (5.0) |
| Rt cryptorchid | 6 (15.0) |
| Age (y) at orchiopexy (range) | 1.9 ± 1.1 (0.8‐6.3) |
| Testis position at surgery, n (%) | |
| Extra‐canalicular | 44 (71.0) |
| Intra‐canalicular | 8 (12.9) |
| Intra‐abdominal | 10 (16.1) |
| Long diameter of testis (mm), (range) | 11 ± 1.9 (6‐15) |
| Age (y) at endocrinological sampling, (range) | 1.9 ± 1.1 (0.8‐6.3) |
| LH (mIU/mL) | 0.3 ± 0.4 (0.2‐1.7) |
| FSH (mIU/mL) | 1.9 ± 1.3 (1.0‐5.0) |
| Testosterone (ng/dL) | 7.6 ± 5.5 (3.0‐20.1) |
| Follow‐up after orchiopexy (y), (range) | 10.7 ± 7.7 (0.2‐23.5) |
| Follow‐up in patients who did not undergo orchiopexy (y), (range) | 9.3 ± 8.3 (0.9‐23.1) |
Normal range for LH: 0‐1 y, 0.3‐1.9 mIU/mL; 2‐5 y, 0.3‐1.2 mIU/mL. Normal range for FSH: 0‐1 y, 0.8‐3.0 mIU/mL; 2‐5 y, 0.8‐2.8 mIU/mL. Normal range for testosterone: <1 y, 12‐21 ng/dL; 1‐6 y, 3‐32 ng/dL.