Table 3.

Pattern/structure coefficients and extracted communalities for the Nightmare Disorder Index

Item	Factor 1: NDI	h 2
1. Frequency	0.62	0.38
2. Awakenings	0.42	0.18
3. Distress	0.75	0.57
4. Impairment	0.53	0.28
5. Duration	0.53	0.28