Differences and Correlations of Anxiety, Sleep Quality, and Pressure-Pain Threshold between Patients with Chronic Low Back Pain and Asymptomatic People

Table 4

Differences in the Pittsburgh Sleep Quality Index between patients with CLBP and asymptomatic people (M ± SD).

	Chronic low back pain (n = 40)	Asymptomatic (n = 40)	t
Time to fall asleep	1.05 ± 0.86	1.16 ± 0.80	0.578	0.565
Sleeping time	0.44 ± 0.64	0.20 ± 0.46	−1.961	0.053
Sleep efficiency	0.28 ± 0.61	0.13 ± 0.41	−1.340	0.184
Sleep disorder	1.41 ± 1.16	0.93 ± 0.39	−2.587	0.011
Sleep quality	1.26 ± 0.75	1.07 ± 0.65	−1.238	0.219
Hypnotics	0.08 ± 0.48	0.00 ± 0.00	−1.075	0.285
Daytime dysfunction	1.90 ± 0.82	1.60 ± 0.69	−1.808	0.074
Total score	6.41 ± 2.43	5.09 ± 2.18	−2.628	0.010

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