Table 1.

Details of psychological constructs and survey questions

Constructa	Survey prompt	Response options	Categorizedb
Worry [22]	In the past 4 weeks, how often have you worried about getting any of the following illnesses? Breast cancer	Rarely or never	Low
		Sometimes	High
		Often
		All the time
Perceived absolute risk [23]	How likely do you think it is that you will develop any of the following illnesses in the future? Breast cancer	Very low	Low risk
		Somewhat low	Moderate risk
		Moderate
		Somewhat high	High risk
		Very high
Perceived comparative risk [23]	Compared to an average woman your age, would you say that you are:	More likely to get breast cancer
		As likely to get breast cancer
		Less likely to get breast cancer
Uncertainty about risk [24]	In the past 4 weeks, how often have you experienced the following because of thoughts and feelings about breast cancer? I have felt uncertain about my risk for breast cancer	Never	Ordinallyc
		Rarely
		Sometimes
		Often
Uncertainty about choices [24]	In the past 4 weeks, how often have you experienced the following because of thoughts and feelings about breast cancer? I have felt uncertain about what my choices are for screening or early detection of breast cancer	Never	Ordinallyc
		Rarely
		Sometimes
		Often

^aReferences corresponding to sources for each survey question are indicated next to each construct name

^bResponse options were collapsed due to small numbers in the extreme categories; perceived comparative risk was treated as-is

^cProportional odds assumption held for both uncertainty measures; thus, they were treated ordinally