Table 4 Descriptive statistics for subscale and total scores of the SHI
From: Psychometric evaluation of the sleep hygiene index: a sample of patients with chronic pain
Subscale | # items | Possible range | M | SD | Intercorrelations | |
|---|---|---|---|---|---|---|
1 | 2 | |||||
1. Sleep disturbing B/E | 7 | 0-28 | 11.45 | 4.33 | ||
2. Irregular sleep-wake schedule | 4 | 0-16 | 7.70 | 3.21 | .34*** | |
3. Total | 11 | 0-44 | 19.16 | 6.58 | .85*** | .77*** |