Table 2.

Spearman correlations between ISI and measures indicating convergent and divergent validity.

	Mean (SD)	Range	ρ
ISI total score	13.98 (7.20)	0, 28	–
Convergent
NSI sleep item	2.23 (1.28)	0, 4	.764**
BDI-II sleep item	1.58 (0.93)	0, 3	.557**
ESS total	10.11 (5.14)	1, 24	.321*
PSQI global score	11.27 (4.23)	1, 19	.757**
Subjective quality	1.87 (0.83)	0, 3	.791**
Latency	2.01 (0.93)	0, 3	.491**
Duration	1.91 (1.06)	0, 3	.582**
Efficiency	1.08 (1.15)	0, 3	.324*
Disturbance	1.77 (0.71)	0, 3	.439**
Sleep medication	1.13 (1.27)	0, 3	.226
Daytime dysfunction	1.51 (0.92)	0, 3	.493**
Divergent
BAI total	12.99 (10.71)	0, 44	.450**
PCL-M total (sleep item excluded)	41.87 (16.85)	16, 76	.513**
BDI-II total (sleep item excluded)	19.65 (12.78)	0, 47	.476**

^**p≤0.001,

^*p≤0.007;

Higher scores for all measures represent worse symptomatology.