Table 2.

Mean, standard deviations, and variance of the TQ 12-I.

	Mean	SD	Item-total correlation
1. I am aware of the noises from the moment I get up to the moment I sleep	1.34	0.75	0.14
2. Because of the noises I worry that there is something seriously wrong with my body	0.61	0.80	0.50
3. If the noises continue my life will not be worth living	0.48	0.80	0.44
4. I am more irritable with my family and friends because of the noises	0.82	0.72	0.66
5. I worry that the noises might damage my physical health	0.74	0.76	0.61
6. I find it harder to relax because of the noises	0.99	0.74	0.65
7. My noises are often so bad that I cannot ignore them	1.14	0.75	0.57
8. It takes me longer to get to sleep because of the noises	0.99	0.82	0.53
9. I am more liable to feel low because of the noises	0.90	0.78	0.71
10. I often think about whether the noises will ever go away	1.19	0.80	0.32
11. I am a victim of my noises	0.73	0.82	0.62
12. The noises have affected my concentration	0.92	0.76	0.70

Item-total correlations were corrected for the individual contribution of each item.