Table 3.
Analysis of the internal consistency and inter-item correlations of the neuropathic pain questionnaires
| Cronbach’s alpha | Inter-item correlation | Cronbach’s α if item deleted | |
|---|---|---|---|
| NPQ-SF | 0.535 | Mean=0.270 | |
| Tingling | 0.413 | 0.330 | |
| Numbness | 0.540 | 0.121 | |
| Increased pain to touch | 0.143 | 0.691 | |
| DN4 | 0.739 | Mean=0.215 | |
| Burning | 0.326 | 0.730 | |
| Painful cold | 0.125 | 0.753 | |
| Electric shocks | 0.564 | 0.691 | |
| Tingling | 0.657 | 0.677 | |
| Pins and needles | 0.466 | 0.708 | |
| Numbness | 0.574 | 0.693 | |
| Itching | 0.170 | 0.748 | |
| Hypoesthesia to touch | 0.554 | 0.693 | |
| Hypoesthesia to pinprick | 0.585 | 0.687 | |
| Brushing | 0.009 | 0.774 | |
| S-LANSS | 0.650 | Mean=0.241 | |
| Pins and needles, shocks, tingling | 0.436 | 0.589 | |
| Autonomic changes | 0.149 | 0.674 | |
| Pain evoked by light touching | 0.330 | 0.623 | |
| Electric shocks or shooting | 0.406 | 0.615 | |
| Hot or burning | 0.453 | 0.634 | |
| Allodynia | 0.530 | 0.555 | |
| Raised pinprick threshold | 0.496 | 0.575 |