Table 4 Cronbach’s alpha and test-retest reliability at the first and second assessment occasions
From: The development and validation of the Cluster Headache Quality of life scale (CHQ)
Scale | Cronbach’s alpha time 1 | Cronbach’s alpha time 2 | Test-retest reliability |
|---|---|---|---|
Restriction of ADL | 0.91 | 0.93 | 0.84 p < 0.01 |
Impact on mood and interpersonal relationships | 0.90 | 0.87 | 0.83 p < 0.01 |
Pain and anxiety | 0.52 | 0.63 | 0.71 p < 0.01 |
Lack of vitality | 0.85 | 0.80 | 0.80 p < 0.01 |