Supplemental Digital Content 4. Item analysis report of Stroke Knowledge Assessment.

Item	Key	A	B	C	D	E	Difficulty Index*	Discrimination Index	
1	B	5	42	1	3	N/A	.82	.44	
2	D	2	0	4	45	N/A	.88	.35	
3	D	5	32	0	14	N/A	.27	.32	
4	D	1	32	3	15	N/A	.29	.00	
5	E	0	1	0	0	50	.98	.06	
6	B	0	38	13	0	N/A	.74	.50	
7	B	1	49	0	1	0	.96	.03	
8	E	1	2	0	2	46	.91	.21	
9	B	0	50	0	0	N/A	.98	.06	
10	B	0	51	N/A	N/A	N/A	1.0	.00	
11	D	0	0	0	51	N/A	1.0	.00	
12	A	48	2	0	0	N/A	.94	.09	
13	A	49	0	0	1	N/A	.96	.12	
*Difficulty Index: Measure of the difficulty of the assessment items, with a range from 0.00 to +1.00. Values of 0.80 and above are considered less difficult (i.e. the majority of participants provided the correct answer) and values of +0.20 or less are considered more difficult (i.e. few participants provided the correct answer).
Discrimination Index: Indicator of test-item quality; measures how well the item discriminates between those participants who know the material and those who do not.  Scores range from -1.00 to +1.00 with higher positive scores signaling better test items.  Values of +0.20 or greater are desired (Oermann & Gaberson, 2014).

Oermann, M.H. & Gaberson, K.B. (2014). Evaluation and testing in nursing education (4th ed.). New York, NY: Springer Publishing Company, LLC.