The development of a knowledge test of depression and its treatment for patients suffering from non-psychotic depression: a psychometric assessment

Table 3 MCQ Distribution and Item Analysis of the Knowledge MCQ

Item	Percentage of responses for each item		Percentage of High and Low Students Responding to Each Option								Total
			A		B		C		D
	Correct	Wrong	High	Low	High	Low	High	Low	High	Low	K	P	D
1	87	13	4	9	95	45	0	36	0	9	B	0.87	0.40
2	51	49	12	18	58	54	16	18	12	9	B	0.51	0.13
3	60	94	4	0	12	81	83	9	0	9	C	0.60	0.80
4	87	13	0	9	91	72	4	18	4	0	B	0.87	0.20
5	89	11	0	0	95	72	4	27	0	0	B	0.89	0.27
6	65	35	0	0	4	27	4	36	91	36	D	0.65	0.47
7	92	8	0	0	0	9	0	18	100	72	D	0.92	0.27
8	94	6	0	9	0	9	0	9	100	72	D	0.94	0.20
9	84	16	0	9	100	45	0	18	0	27	B	0.84	0.47
10	46	54	41	54	0	18	0	18	58	9	D	0.46	0.67
11	54	46	62	36	37	54	0	9	0	0	A	0.54	0.33
12	94	6	0	9	0	9	0	0	100	81	D	0.94	0.13
13	67	33	20	9	0	0	79	63	0	27	C	0.67	0.33
14	94	6	0	0	0	0	0	18	100	81	D	0.94	0.13
15	91	9.5	0	0	95	81	4	9	0	9	B	0.91	0.13
16	87	13	95	54	4	27	0	0	0	18	A	0.87	0.33
17	95	5	4	0	95	90	0	0	0	9	B	0.95	0.00
18	91	9.5	0	0	0	9	0	18	100	72	D	0.91	0.20
19	67	33	8	54	4	0	4	18	83	27	D	0.67	0.67
20	87	13	4	9	0	0	0	18	95	72	D	0.87	0.13
21	91	9	100	100	0	0	0	0	0	0	A	0.91	0.07
22	33	67	8	18	4	27	50	9	37	45	C	0.33	0.40
23	98	2	0	0	100	100	0	0	0	0	B	0.98	0.00
24	38	62	0	9	70	18	12	36	16	36	B	0.38	0.53
25	92	8	0	9	0	9	0	9	100	72	D	0.92	0.20
26	89	11	4	18	0	0	0	18	95	63	D	0.89	0.20
27	87	13	0	9	0	0	100	63	0	27	C	0.87	0.27

K, Key (correct) Response; P, Difficulty Index; D, Discrimination Value
A, B, C, & D: Response choices to each possible answer for each item in the High and Low performer groups.
Discrimination values are identified as follows;
0. 5 -- 1.0 High discrimination (items n = 4)
0.3 -- 0.5 Moderate discrimination (items n = 7)
0.1-- 0.3 Some discrimination (items n = 13)
< 0.1 Poor discrimination (items n = 3)