Confirmatory factor analysis of the Appraisal of Self-Care Agency Scale - Revised

Stacciarini, Thaís Santos Guerra; Pace, Ana Emilia

doi:10.1590/1518-8345.1378.2856

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Revista Latino-Americana de Enfermagem

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Original Article • Rev. Latino-Am. Enfermagem 25 • 2017 • https://doi.org/10.1590/1518-8345.1378.2856 copy

Confirmatory factor analysis of the Appraisal of Self-Care Agency Scale - Revised¹ 1 Paper extracted from Doctoral Dissertation “Adaptation and validation of the scale to evaluate the self-care capacity Appraisal of Self-care Agency Scale - Revised for Brazil”, presented to Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo, WHO Collaborating Centre for Nursing Research Development, Ribeirão Preto, SP, Brazil.

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Objective:

to analyze the factor structure of the Appraisal of Self-Care Agency Scale-Revised (ASAS-R), adapted for Brazil.

Method:

methodological study conducted with 150 individuals with diabetes mellitus cared for by the Family Health Strategy, most of whom are elderly with low educational levels. The test of the hypothesis concerning the confirmatory factor composition of the ASAS-R was performed using latent variables structural equations.

Results:

the model’s goodness-of-fit indexes were satisfactory (χ² = 259.19; χ²/g.l = 2.97, p < 0.001; GFI = 0.85; RMR = 0.07; RMSEA = 0.09); the factor loads were greater than 0.40; and most item-to-factor-correlations presented moderate to strong magnitude (0.34 to 0.58); total alpha value was 0.74, while the alpha of the three factors were 0.69, 0.38 and 0.69, respectively.

Conclusion:

the scale’s factor structure presented satisfactory validity and reliability results, with the exception of one factor. Application of this scale to samples of the general population is desirable in order to strengthen analyses of internal consistency and the dimensionality of the factor structure. This study is expected to contribute to further studies addressing the self-care agency construct and the development of the ASAS-R.

Descriptors:
Validation Studies; Psychometrics; Factor Analysis; Diabetes Mellitus; Self-Care

Sociodemographic and clinical characteristics	n	%	Interval	Median	Mean	SD
Sex
Female	83	55.3
Male	67	44.7
Age group (years)			18 - 94	64	58.6	16.4
< 60	56	37.3
≥ 60	94	62.7
Marital status
Married/stable union	72	48.0
Single	39	26.0
Widowed	33	22.0
Divorced/separated	6	4.0
Occupation
Retired/pensioner	76	50.7
Employed	48	32.0
Homemaker	20	13.3
Unemployed	1	0.7
Student	5	3.3
Education
Illiterate	17	11.3
No education/can write and read	14	9.3
1-9 years of school	74	49.4
≥ 9 years of school	45	30.0
Income (minimum wage*) Family income			0- 2,200.00	1,000.00	924.63	556.75
Time since DM diagnosis (years)			1 - 41	13	10.5	8.78
Time taking insulin (years)			1 - 40	5	6.41	6.24

Factor/Item	Item-factor correlation	Cronbach’s α of excluded item
Factor 1: having power for self-care
α_total = 0.69
Item 1	0.41	0.61
Item 2	0.40	0.62
Item 3	0.58	0.55
Item 5	0.48	0.58
Item 6	0.25	0.72
Item 10	0.34	0.65
Factor 2. Developing power for self-care
α_total = 0.38
Item 7	0.44	0.07
Item 8	0.25	0.30
Item 9	0.17	0.36
Item 12	0.39	0.20
Item 13	-0.18	0.56
Factor 3. Lacking power for self-care
α_total = 0.69
Item 4	0.40	0.70
Item 11	0.43	0.60
Item 14	0.48	0.57
Item 15	0.51	0.51

Scale’s items	Factor loads			h²
Scale’s items	1	2	3
Item 1	0.76	0.06	-0.05	0.58
Item 2	0.55	-0.45	0.07	0.50
Item 3	0.75	0.02	0.10	0.57
Item 5	0.64	-0.04	0.36	0.54
Item 6	0.12	-0.017	0.49	0.28
Item 10	0.41	-0.004	0.40	0.33
Item 7	0.39	0.30	0.63	0.64
Item 8	0.71	0.12	0.07	0.52
Item 9	-0.03	0.64	0.14	0.44
Item 12	0.20	0.27	0.54	0.41
Item 13	-0.17	-0.64	0.11	0.45
Item 4	-0.05	0.63	0.17	0.45
Item 11	0.02	0.06	0.68	0.46
Item 14	-0.01	0.07	0.83	0.70
Item 15	0.01	0.35	0.57	0.45
Eigenvalues	2.20	1.32	3.80
Variance explained for each factor	14.48%	8.74%	25.28%
Total variance explained	48.6%

Escola de Enfermagem de Ribeirão Preto / Universidade de São Paulo Av. Bandeirantes, 3900, 14040-902 Ribeirão Preto SP Brazil, Tel.: +55 (16) 3315-3451 / 3315-4407 - Ribeirão Preto - SP - Brazil
E-mail: rlae@eerp.usp.br

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[1] Corresponding Author: Thaís Santos Guerra Stacciarini Universidade Federal do Triângulo Mineiro, Hospital de Clínicas Rua José Pimenta Camargo, 332 Parque do Mirante CEP: 38081-230, Uberaba, MG, Brasil E-mail: thais.stacciarini@terra.com.br