Self-Efficacy in Self-Care and Its Related Factors Among Patients with Coronary Heart Disease in Indonesia: A Rasch Analysis

Figures & data

Table 1 Psychometric Attribute of the Instrument (n=103)

Psychometric Attribute	SEQ-CHDM
No of item	26
Raw explain variance by measure	27.2%
Unexplained variance	<15%
Cronbach’s alpha	0.77
Person reliability	0.73
Person separation	1.66
Item reliability	0.95
Item separation	4.27
Mean Person	76.9
Mean Item	304.7

Table 2 Characteristics of Respondents (n=103)

Variable	Frequency (f)	Percentage (%)
Gender
Female	27	26.2
Male	76	73.8
Age
26–35 years old	5	4.9
36–45 years old	11	10.7
46–55 years old	26	25.2
> 56 years old	61	59.2
Educational Background
Elementary School	18	17.5
Junior High School	14	13.6
Senior High School	44	42.7
Higher Education	27	26.2
Care unit
Inpatient	52	50.5
Outpatient	51	49.5
Duration ill
≤ 6 months	43	41.7
> 6 months	60	58.3
Treatment
Revascularization and Medications	50	48.5
Medications Only	53	51.5

Table 3 Level of Self-Efficacy (n=103)

SE Category	SE Logit	SE Scores	Frequency (f)	Percentage (%)
Low	<0.00	≤66	6	5.8
Moderate	≤1.07–0.00	≤75–67	53	51.5
High	>1.07	>75	44	42.7
Total			103	100

Abbreviation: SE, Self-efficacy.

Figure 1 Wright Map of Self-efficacy.

Notes: The “Measure” section on the leftmost Wright map shows the logit score. The “person” section on the left of the Wright map describes the serial number of respondents based on SE ability level. While, the “Item” section on the right of the Wright map describes the questionnaire number from the most confident or unconfident thing to be done by respondents. In addition, M is mean for item and person; S means one standard deviation away from mean value; and T means two standard deviation away from mean value.

Abbreviation: SE, Self-efficacy.

Table 4 Relationship Between Characteristics of Respondent on Self-Efficacy (n=103)

Variable	Self-Efficacy						n (%)	χ^2	p-value
	Low		Moderate		High
	n	%	n	%	n	%
Gender
Female	2	1.9	17	16.5	8	7.8	27 (26.2)	2.57	0.277
Male	4	3.8	36	35	36	35	76 (73.8)
Age
26–35 years old	1	1	3	2.9	1	1	5 (4.9)	6.26	0.395
36–45 years old	0	0	5	4.9	6	5.8	11 (10.7)
46–55 years old	1	1	17	16.5	8	7.8	26 (25.2)
> 56 years old	4	3.9	28	27.2	29	28.2	61 (59.2)
Educational Background
Elementary School	0	0	13	12.6	5	4.9	18 (17.5)	7.16	0.306
Junior High School	1	1	9	8.7	4	3.9	14 (13.6)
Senior High School	3	2.9	21	20.4	20	19.4	44 (42.7)
Higher Education	2	1.9	10	9.7	15	14.6	27 (26.2)
Care Unit
Inpatient	0	0	34	33	18	17.5	52 (50.5)	11.7	0.003*
Outpatient	6	5.8	19	18.4	26	25.2	51 (49.5)
Duration of ill
≤ 6 months	1	1	28	27.2	14	13.6	43 (41.7)	6.01	0.049*
> 6 months	5	4.9	25	24.3	30	29.1	60 (58.3)
Treatment
Revascularization and Medications	2	1.9	24	23.3	24	23.3	50 (48.5)	1.42	0.493
Medications only	4	3.9	29	28.2	20	19.4	53 (51.5)

Note: *Chi-square test with significant value <0.05.

Abbreviation: SE, Self-efficacy.