Validation of the adherence questionnaire for Brazilian chronic kidney disease patients under hemodialysis

Lins, Silvia Maria de Sá Basilio; Leite, Josete Luzia; Godoy, Simone de; Fuly, Patrícia dos Santos Claro; Araújo, Silvia Teresa Carvalho de; Silva, Ítalo Rodolfo

doi:10.1590/0034-7167-2016-0437

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Revista Brasileira de Enfermagem

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Sumário

RESEARCH • Rev. Bras. Enferm. 70 (3) • May-Jun 2017 • https://doi.org/10.1590/0034-7167-2016-0437 copy

Validation of the adherence questionnaire for Brazilian chronic kidney disease patients under hemodialysis

Validez del cuestionario de adhesión del paciente renal crónico en hemodiálisis para Brasil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Objective:

To validate the evaluation questionnaire on adherence of chronic kidney disease (CKD) patients under hemodialysis.

Method:

We verified the following psychometric properties of the instrument: reliability (stability and internal consistency) and validity (face, content, and construct).

Results:

The intraclass correlation coefficient reached a value of 0.98 for the adherence questions and 0.91 for the perception questions. Regarding the kappa of the 14 questions examined, 12 had a value > 0.8, whereas the Cronbach's alpha had a value of 0.57. Experts ensured the face and content validity of the instrument, giving it an overall content validity index of 0.96. Construct validity, analyzed by Mann-Whitney test, was achieved as all domains showed a significant association with p<0.01.

Conclusion:

We verified, by the presented results, that the instrument has been validated for use in Brazil.

Descriptors:
Patient Cooperation; Medication Adherence; Chronic Kidney Disease; Kidney Dialysis; Nursing in Nephrology

Domain	Intraclass Correlation Coefficient	Confidence interval (95%)
Adherence	0.98	0.95; 0.99
Perception	0.91	0.75; 0.97

Question	Adherence	n	Mean	Standard Deviation	Minimum	1^st quartile	Median	3^rd quartile	Maximum	p value
Q14	Adherent	53	294.34	23.33	200.00	300.00	300.00	300.00	300.00	< 0.01
Hemodialysis	Non-adherent	25	242.00	75.94	50.00	200.00	300.00	300.00	300.00	< 0.01
Q17	Adherent	53	183.02	35.28	0.00	150.00	200.00	200.00	200.00	< 0.01
Hemodialysis	Non-adherent	25	86.00	44.53	0.00	100.00	100.00	100.00	150.00	< 0.01
Q18	Adherent	53	80.66	35.57	0.00	75.00	100.00	100.00	100.00	< 0.01
Hemodialysis	Non-adherent	25	24.00	18.37	0.00	0.00	25.00	25.00	50.00	< 0.01
Hemodialysis	Adherent	53	967.45	154.23	575.00	850.00	1000.00	1100.00	1200.00	< 0.01
Subscale	Non-adherent	25	694.00	166.97	400.00	550.00	675.00	850.00	950.00	< 0.01
Q26	Adherent	73	177.40	44.91	0.00	150.00	200.00	200.00	200.00	< 0.01
Medication	Non-adherent	5	30.00	44.72	0.00	0.00	0.00	50.00	100.00	< 0.01
Q31	Adherent	64	128.91	58.29	0.00	100.00	150.00	175.00	200.00	< 0.01
Water Intake	Non-adherent	14	7.14	18.16	0.00	0.00	0.00	0.00	50.00	< 0.01
Q46	Adherent	67	126.87	64.74	0.00	100.00	150.00	200.00	200.00	< 0.01
Diet	Non-adherent	11	27.27	60.68	0.00	0.00	0.00	50.00	200.00	< 0.01

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[1] CORRESPONDING AUTHOR: Silvia Maria de Sá Basilio Lins. E-mail: silviamarialins@gmail.com