Table 2 Internal consistency regarding to the overall sample and the subsample reporting bodily pain (Internal consistency: Cronbach's alpha of the first two items building the total score).
Consistency: Modalities and characteristics of the sleep items | All participants (n = 16'191) | Participants reporting pain (n = 10'610) | Participants with sleep problems only because of bodily pain (n = 899) | |||
|---|---|---|---|---|---|---|
ICC | Cronbach's α | ICC | Cronbach's α | ICC | Cronbach's α | |
Sleep | 0.83 | 0.82 | 0.79 | |||
Sleep quality | 0.89 | 0.89 | 0.85 | |||
Effects of sleep problems on fatigue | 0.86 | 0.85 | 0.83 | |||