Table 3.

Instrument performance: range, mean (SD) and estimates of internal consistency reliability

Variable	[range]	mean	(SD)	Cronbach’s Alpha
Distress (Impact of Events Scale)	[1–46]	8.20	(11.1)	0.890
Health Literacy (Set of Brief Questions)	[6–12]	10.91	(1.3)	0.511
Knowledge about Breast Cancer Genetics (BGKQ)	[1–24]	10.26	(5.5)	0.854
Numeracy (Rausch Based Numeracy Scale)	[2–8]	4.48	(1.5)	0.530

Note: n = 85 for all instruments except numeracy. One participant refused to answer all numeracy questions and was excluded from analysis of that instrument. The Impact of Events Scale categories are high distress > 19, medium 8.5–19 and low <8.5 (Horowitz et al. 1979)