Regensburg Insomnia Scale (RIS): a new short rating scale for the assessment of psychological symptoms and sleep in insomnia; Study design: development and validation of a new short self-rating scale in a sample of 218 patients suffering from insomnia and 94 healthy controls

Table 3 Component analysis with Varimax rotation of the RIS in 218 insomnia patients

RIS Items	I	II	III	IV	Communalities
1. Sleep latency	−.29	.70	.01	.33	0.68
2. Sleep duration	.44	.69	−.10	−.08	0.69
3. Sleep continuity	.81	.08	−.01	.04	0.66
4. Early awakening	.79	−.04	.00	.02	0.63
5. Easy awakening	.65	.10	−.14	−.08	0.47
6. Sleepless nights	.19	.71	.26	−.27	0.68
7. Thinking about sleep	.15	−.14	.90	.02	0.85
8. Fear of insomnia	−.07	.42	.74	.13	0.75
9. Impaired daytime	.03	.25	.04	−.73	0.61
10. Hypnotic intake	.05	.29	.19	.67	0.58
Variance	20.56%	18.52%	14.95%	12.01%

Component I: Sleep depth, Component II: Sleep quantity, Component III: Fearfully focussing on insomnia and component IV: Sleep medication/daytime functioning.

ISSN: 1477-7525