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Table 3 Pairwise comparison between areas under the ROC curve

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

  1. *Confidence interval, a Pittsburgh sleep quality index, b Insomnia severity index, c sleep item of the Roland and Morris disability questionnaire, d Epworth sleepiness scale.