Population characteristics
| Feature | All (n=50) | Group 1 (n=15) | Group 2 (n=35) | P value |
| Parents | ||||
| Age (year), mean (SD) | 35 (5) | 36 (5) | 35 (5) | 0.27* |
| Gender | 0.85† | |||
| Man | 11 (22%) | 3 (20%) | 8 (23%) | |
| Woman | 39 (78%) | 12 (80%) | 27 (77%) | |
| Children | ||||
| Age (year), mean (SD) | 2 (1) | 3 (1) | 2 (1) | 0.65* |
*Based on Mann-Whitney test.
†Based on Fisher test.