Refining a questionnaire to assess breast cancer knowledge and barriers to screening in Kenya: Psychometric assessment of the BCAM

Table 4 Internal consistency

	Among those who did not attend screening							Among those who attended screening
Item	n	Sign	ITC	IRC	AIIC	CA	n	Sign	ITC	IRC	AIIC	CA
DOMAIN 1
Do you think changes in the size of your breast could be a sign of breast cancer?	465	+	0.86	0.69	0.65	0.79	594	+	0.81	0.57	0.61	0.76
Do you think changes in the size of your nipple could be a sign of breast cancer?	465	+	0.88	0.73	0.59	0.74	594	+	0.85	0.65	0.51	0.67
Do you think changes in the shape of your breast or nipple could be signs of breast cancer?	465	+	0.86	0.68	0.66	0.79	594	+	0.85	0.64	0.52	0.69
Test scale					0.63	0.84					0.55	0.80
DOMAIN 4
FACTOR 1
Would you be too embarrassed to go and see the doctor?	467	+	0.83	0.71	0.49	0.79	594	+	0.83	0.72	0.51	0.81
Would you be too scared to go and see the doctor?	467	+	0.86	0.76	0.47	0.78	594	+	0.78	0.65	0.54	0.83
Would you be worried about wasting the doctor’s time?	467	+	0.82	0.69	0.49	0.80	594	+	0.88	0.80	0.47	0.78
I find the doctor difficult to talk to	467	+	0.73	0.57	0.55	0.83	593	+	0.78	0.63	0.56	0.83
Difficult to make an appointment with the doctor	467	+	0.69	0.51	0.58	0.85	594	+	0.71	0.55	0.59	0.85
Test scale					0.51	0.84					0.53	0.85
FACTOR 2
Would your doctor not understand your language?	467	+	N/A	N/A	0.73	0.85	594	+	N/A	N/A	0.43	0.60
Would your doctor not understand your culture?	467	+	N/A	N/A			594	+	N/A	N/A

ITC item-test correlation, IRC _- item-rest correlation, AIIC Average inter item correlation, CA Cronbach’s alpha
Item-test and item-rest correlations are only applicable when more than two variables are under assessment

ISSN: 1472-6963