Table 3:

Correlations between Insomnia Severity Index and polysomnographic results

Insomnia Severity Index	Polysomnography measures
	SOL a	NA b	SE c	TST d
	r (P)	r (P)	r (P)	r (P)
Difficulties of falling asleep	0.56 (< 0.001)			–0.31 (< 0.001)
Nocturnal awakenings		0.19 (0.025)		–0.37 (< 0.001)
Early morning awakenings				–0.21 (0.002)
Dissatisfaction			–0.34 (0.260)	–0.3 (0.020)
Total score				–0.29 (0.001)

^a SOL, sleep onset latency.

^b NA, number of awakenings.

^c SE, sleep efficiency.

^d TST, total sleep time.