From: Detecting insomnia in patients with low back pain: accuracy of four self-report sleep measures
Comparison | Difference between areas | z statistic | P-value |
---|---|---|---|
 | (95% CI) * |  |  |
Pittsburgh questionnairea vs Insomnia indexb | 0.01 (−0.07 to 0.09) | 0.18 | 0.85 |
Pittsburgh questionnairea vs Roland itemc | 0.14 (0.01 to 0.28) | 2.11 | 0.03 |
Pittsburgh questionnairea vs Epworth scale d | 0.26 (0.09 to 0.41) | 3.03 | 0.002 |
Insomnia indexb vs Roland itemc | 0.13 (0.003 to 0.27) | 2.00 | 0.04 |
Insomnia indexb vs Epworth scaled | 0.25 (0.09 to 0.41) | 3.05 | 0.002 |
Epworth scaled vs Roland itemc | 0.11 (−0.05 to 0.28) | 1.33 | 0.18 |