Table 2.
Internal consistency results for PedsQL GCS and CHU9D among children aged 10–17 years old by clinical condition
| Condition | Variable | Cronbach’s alpha valuea | Item-total correlations rangeb |
|---|---|---|---|
| 1. Sample without any of the 6 conditions (n = 12,075) | CHU9D Total utility score scale | 0.7855 | 0.3622–0.5861 |
| PedsQL GCS Total score scale | 0.9048 | 0.4122–0.6002 | |
| PedsQL GCS Physical health summary score subscale | 0.8586 | 0.3691–0.7784 | |
| PedsQL GCS Emotional functioning summary score subscale | 0.8038 | 0.5158–0.6646 | |
| PedsQL GCS Social functioning summary score subscale | 0.7934 | 0.5114–0.6302 | |
| PedsQL GCS School functioning summary score subscale | 0.7506 | 0.3956–0.6354 | |
| 2. Asthma (n = 1957) | CHU9D Total utility score scale | 0.8069 | 0.3833–0.5975 |
| PedsQL GCS Total score scale | 0.9221 | 0.4588–0.6585 | |
| PedsQL GCS Physical health summary score subscale | 0.8658 | 0.4158–0.7972 | |
| PedsQL GCS Emotional functioning summary score subscale | 0.8477 | 0.5874–0.7186 | |
| PedsQL GCS Social functioning summary score subscale | 0.8331 | 0.5950–0.6879 | |
| PedsQL GCS School functioning summary score subscale | 0.7749 | 0.4616–0.6486 | |
| 3. Anxiety/depression (n = 1227) | CHU9D Total utility score scale | 0.8390 | 0.4405–0.6996 |
| PedsQL GCS Total score scale | 0.9037 | 0.4003–0.6343 | |
| PedsQL GCS Physical health summary score subscale | 0.8452 | 0.4395–0.7303 | |
| PedsQL GCS Emotional functioning summary score subscale | 0.7820 | 0.4642–0.6488 | |
| PedsQL GCS Social functioning summary score subscale | 0.8427 | 0.6174–0.7082 | |
| PedsQL GCS School functioning summary score subscale | 0.7718 | 0.4390–0.6396 | |
| 4. ADHD (n = 519) | CHU9D Total utility score scale | 0.8312 | 0.3660–0.6026 |
| PedsQL GCS Total score scale | 0.8977 | 0.3654–0.5849 | |
| PedsQL GCS Physical health summary score subscale | 0.8383 | 0.3807–0.7402 | |
| PedsQL GCS Emotional functioning summary score subscale | 0.8071 | 0.5005–0.6945 | |
| PedsQL GCS Social functioning summary score subscale | 0.8197 | 0.5040–0.7218 | |
| PedsQL GCS School functioning summary score subscale | 0.7034 | 0.3765–0.5328 | |
| 5. Autism/Asperger's (n = 524) | CHU9D Total utility score scale | 0.8018 | 0.3859–0.5752 |
| PedsQL GCS Total score scale | 0.8963 | 0.3540–0.6032 | |
| PedsQL GCS Physical health summary score subscale | 0.8458 | 0.4049–0.7359 | |
| PedsQL GCS Emotional functioning summary score subscale | 0.8200 | 0.4977–0.6989 | |
| PedsQL GCS Social functioning summary score subscale | 0.8327 | 0.5931–0.7145 | |
| PedsQL GCS School functioning summary score subscale | 0.7114 | 0.3735–0.5971 | |
| 6. Epilepsy (n = 73) | CHU9D Total utility score scale | 0.7623 | 0.3170–0.5742 |
| PedsQL GCS Total score scale | 0.9468 | 0.4727–0.8415 | |
| PedsQL GCS Physical health summary score subscale | 0.8826 | 0.5177–0.8170 | |
| PedsQL GCS Emotional functioning summary score subscale | 0.8726 | 0.6307–0.7770 | |
| PedsQL GCS Social functioning summary score subscale | 0.8879 | 0.6887–0.7779 | |
| PedsQL GCS School functioning summary score subscale | 0.8351 | 0.4956–0.7519 | |
| 7. Diabetes – type 1 (n = 64) | CHU9D Total utility score scale | 0.6504 | 0.0946–0.5599 |
| PedsQL GCS Total score scale | 0.9343 | 0.3600–0.7065 | |
| PedsQL GCS Physical health summary score subscale | 0.9121 | 0.4866–0.8228 | |
| PedsQL GCS Emotional functioning summary score subscale | 0.8962 | 0.7135–0.7942 | |
| PedsQL GCS Social functioning summary score subscale | 0.7885 | 0.4446–0.6469 | |
| PedsQL GCS School functioning summary score subscale | 0.7661 | 0.4165–0.6744 |
ADHD attention deficit hyperactivity disorder, CHU9D Child Health Utility 9D, PedsQL GCS Pediatric Quality of Life Inventory™ v4.0 Generic Core Scales
aAcceptable Cronbach’s alpha threshold ≥ 0.7
bAcceptable item-total correlations threshold ≥ 0.2