Table 2.

Measurement Scales and Reliability Statistics

Measurement scales	T1	T2
Attitudes toward radon testing:
bad – good, negative – positive, unfavorable – favorable, dislike – like, and worthless – valuable	.95a	.95a
Perceived severity of the threat:
• I feel lung cancer would be a very serious illness for me.  • If I had lung cancer, my whole life would change.	.62b	.70b
Perceived susceptibility of the threat:
• I am more likely to get lung cancer because of how I live my life.  • Personally, I feel vulnerable to developing lung cancer.	.74b	.86b
Response efficacy:
• I feel that a radon test would help me personally to reduce my risk of lung cancer.  • I have a lot to gain from conducting a radon test in my home.	.80b	.91b
Self-efficacy:
• If I wanted, I could easily perform a radon test.  • I feel like I would know how to test my home for radon if I wanted to.	.79b	.81b

^a calculated by Cronbach’s alpha

^b calculated by Spearman-Brown coefficient