. 2015 Jul 11;15:637. doi: 10.1186/s12889-015-1958-0

Table 3.

Evaluation of items based on item response theory and confirmatory factor analysis

		Correct (%)	Item correlation to dimension score	Factor loading	IRT parameters
		Correct (%)	Item correlation to dimension score	Factor loading	Discrimination	Difficulty
Dimension 1: Knowledge and attitudes
A01	Prevention of influenza	66.2	0.44	0.37	0.60	−0.82
A02	Hypertension	85.3	0.40	0.35	0.75	−1.78
A03	Health food	88.3	0.28	0.24	0.51	−2.67^a
A04	Transfusion	64.4	0.51	0.47	0.80	−0.63
A05	AIDS detection and consultation	92.1	0.32	0.28	0.74	−2.43^a
A06	Pregnancy and hazardous job	91.2	0.31	0.25	0.65	−2.54^a
A08	Range of body temperature	76.5	0.27	0.20	0.33	−2.25^a
A11	Food label	96.7	0.23	0.19	0.74	−3.21^a
A15	Health examination	72.8	0.44	0.39	0.68	−1.11
B01	Definition of health	71.5	0.59	0.55	1.18	−0.79
B02	Improve resident’s health	78.4	0.56	0.50	1.19	−1.06
B03	Blood donation	80.4	0.50	0.46	0.99	−1.24
B04	Transmission of hepatitis B	70.7	0.51	0.48	0.83	−0.89
B05	Self-measured blood pressure	51.7	0.50	0.48	0.74	−0.11
B07	Early signals of cancer	60.4	0.59	0.57	1.06	−0.41
B08	Chronic diseases	56.7	0.50	0.49	0.76	−0.32
B09	Management of gas poisoning	80.4	0.49	0.43	0.93	−1.29
B10	Treatment of tuberculosis	80.9	0.40	0.36	0.66	−1.62
B11	Folic acid supplementation	56.5	0.53	0.53	0.85	−0.30
B12	Occupational protection	69.6	0.53	0.48	0.87	−0.81
B13	Iodine deficiency	71.9	0.53	0.51	0.95	−0.87
B14	Pesticide residues	41.0	0.31	0.31	0.40	0.56^a
B18	Children immunization	85.4	0.47	0.42	0.99	−1.53
B23	Health knowledge	71.2	0.44	0.41	0.66	−1.04
B26	Warning icons	71.0	0.57	0.55	1.08	−0.80
B31	Adult pulse	72.7	0.49	0.46	0.81	−0.99
B34	Dog bite	90.4	0.29	0.21	0.57	−2.72^a
B38	Expired food	87.0	0.46	0.42	1.01	−1.62
C02	Liver function	27.9	0.48	0.52	0.88	0.85
C03	Transmission of tuberculosis	30.4	0.43	0.47	0.72	0.83
C04	Child fever and rash	51.9	0.58	0.59	1.01	−0.12
C05	Osteoporosis	10.8	0.42	0.48	1.41	1.53
C06	Prevention of chronic diseases	43.4	0.55	0.55	0.91	0.20
C07	Health food selection	54.5	0.60	0.62	1.09	−0.21
C08	Dead livestock	70.5	0.52	0.50	0.86	−0.87
C17	Pesticide custody	61.7	0.34	0.29	0.32	−0.90^a
D06	Weight control	70.9	0.50	0.47	0.73	−0.38
D07	Obesity-related disease	75.2	0.53	0.53	0.90	−0.86
Dimension 2: Behavior and lifestyle
A07	Fruit and vegetable	75.2	0.40	0.36	0.53	−1.44
A09	Internet addiction	90.4	0.20	0.16	0.29	−4.74^a
A10	Child and adolescent depression	87.6	0.37	0.32	0.68	−2.07^a
A12	Lack of sleep	92.4	0.30	0.25	0.68	−2.60^a
A13	Obtain health knowledge	93.3	0.30	0.26	0.72	−2.61^a
A14	Attitude toward chronic diseases	57.0	0.38	0.32	0.41	−0.45^a
B06	Smoking	54.9	0.55	0.63	0.83	−0.21
B15	Sport and electrolytes	70.0	0.48	0.44	0.71	−0.90
B16	Mental health	86.0	0.51	0.50	1.34	−1.34
B17	Public health service	46.3	0.56	0.52	0.88	0.12
B19	Fever symptom	79.3	0.42	0.33	0.64	−1.51
B20	Adverse drug reaction	79.0	0.39	0.31	0.57	−1.62^a
B21	Health care card for pregnant women	52.6	0.45	0.40	0.57	−0.14
B27	Medical care procedure	71.8	0.57	0.54	1.14	−0.78
B29	House ventilation	65.7	0.50	0.45	0.79	−0.66
B39	Drug addiction	61.1	0.52	0.52	0.76	−0.48
C01	Mental health promotion	50.8	0.58	0.55	0.99	−0.05
C10	Bean products	23.4	0.52	0.49	1.03	1.00
C11	Sport and health	41.5	0.60	0.58	1.10	0.26
C13	Cough and sneeze	32.4	0.51	0.45	0.81	0.70
C14	Length of hospital stay	59.8	0.56	0.54	0.90	−0.39
C15	Management of type 2 diabetes	26.8	0.55	0.50	1.03	0.84
Dimension 3: Skills
B22	Medical institutions	77.4	0.55	0.52	1.12	−0.88
B24	Infectious diseases	78.2	0.58	0.55	1.35	−0.82
B25	Food poisoning	78.6	0.57	0.54	1.36	−0.85
B28	OTC drugs	37.3	0.54	0.51	0.59	1.05
B30	Reading a thermometer	51.2	0.59	0.56	0.80	0.18
B32	Prenatal examination	41.2	0.44	0.39	0.38	1.05
B33	Condoms and STDs	84.2	0.52	0.51	1.19	−1.13
B35	Slight burns and scalds	70.9	0.49	0.44	0.69	−0.80
B36	Fire escape	77.8	0.46	0.41	0.66	−1.24
B37	Bleeding wound management	22.7	−0.04	−0.16	0.03	0.00^a
B40	Electrical injury	70.6	0.43	0.40	0.42	−1.04
C09	Cardiopulmonary resuscitation	53.7	0.65	0.65	1.06	0.09
C12	Diabetes	43.8	0.51	0.46	0.53	0.60
C16	Brest feeding	42.3	0.51	0.50	0.56	0.70
C18	Lightning storms	76.9	0.44	0.40	0.58	−1.23
D01	Indications of amoxicillin	25.0	0.55	0.54	0.86	1.42
D02	Use of amoxicillin	64.4	0.50	0.43	0.55	−0.38
D03	Adverse reaction of amoxicillin	54.2	0.65	0.62	1.07	0.05
D04	Calculation of BMI	41.8	0.62	0.58	0.94	0.60
D05	Classification of BMI	45.7	0.59	0.53	0.77	0.46

^aItems that met two or more criteria for deletion were removed