Table 2.
Internal consistency reliability of ND-PROM constructs across DS and ASD groups.
| ND-PROM Domains | Cronbach’s Alpha DS/ASD/DS+ASD | McDonald’s Ω DS/ASD/DS+ASD |
|---|---|---|
| F1: Expressive Language | 0.925/0.932/0.923 | 0.932/0.937/0.924 |
| F2: Receptive Language | 0.769/0.856/0.835 | 0.780/0.871/0.723 |
| F3: Nonverbal Communication | 0.803/0.835/0.694 | 0.816/0.851/0.723 |
| F4: Social Emotional Understanding | 0.830/0.883/0.899 | 0.836/0.885/0.906 |
| F5: Social Interaction | 0.871/0.907/0.889 | 0.865/0.906/0.893 |
| F6: Independent Play | 0.734/0.794/N.E. | 0.795/0.820/N.E. |
| F7: Adaptive Skills/Toileting | 0.772/0.632/0.752 | 0.868/0.821/0.797 |
| F8: Restricted and Repetitive Behaviors and Interests | 0.862/0.852/0.842 | 0.874/0.863/0.876 |
| F9: Sensory Processes | 0.578/0.632/0.599 | 0.564/0.592/0.538 |
| F10: Challenging Behaviors | 0.719/0.693/0.650 | 0.774/0.714/0.640 |
| F11: Impulse/ADHD | 0.773/0.701/0.635 | 0.786/0.730/0.682 |
| F12: Mental Health | 0.735/0.768/0.747 | 0.760/0.793/N.E. |
Internal Consistency Reliability measures for Down syndrome (DS), and autism spectrum disorder (ASD) groups for each of the 12 domains of the ND-PROM. N.E., Not estimable; ADHD, attention deficit/hyperactivity disorder.