Validity and reliability of short form-12 questionnaire in Iranian hemodialysis patients

Amir H. Pakpour; Saeedeh Nourozi; Stig Molsted; Adrian P Harrison; Khadije Nourozi; Bengt Fridlund

Validity and reliability of short form-12 questionnaire in Iranian hemodialysis patients

Amir H. Pakpour, Saeedeh Nourozi, Stig Molsted, Adrian P Harrison, Khadije Nourozi, Bengt Fridlund

Abstract

INTRODUCTION: The aim of the study was to assess the validity and reliability of the SF-12 questionnaire in a sample of Iranian patients undergoing hemodialysis.

MATERIALS AND METHODS: One hundred and forty-four hemodialysis patients were included from dialysis centers in Zanjan, Iran, and were asked to complete the SF-12 and SF-36 questionnaires. An initial test-retest reliability evaluation was performed on a sample of 70 patients from the total group, with a retest interval of 14 days. Reliability was estimated by internal consistency and validity was assessed using known-group comparisons and construct validity on the patient group as a whole. A linear regression analysis was used to assess any variation in the physical component summary and mental component summary scores of the SF-36 with the respective component summary scores of the SF-12. In addition, the factor structure of the questionnaire was extracted by performing a confirmatory factor analysis.

RESULTS: Cronbach alpha for physical and mental component summaries were 0.89 and 0.90, respectively. The SF-12 showed a good discriminatory ability between subgroups of patients based on demographic and clinical variables. The confirmatory factor analysis for the original two-factor structure showed a good fit index (chi2 = 23.30, degrees of freedom = 13), goodness-of-fit index = 0.96, and root mean squared error of approximation = 0.079).

CONCLUSIONS: In general, the SF-12 has good psychometric properties and can be used as a shorter version of the SF-36 questionnaire in future studies involving Iranian patients undergoing hemodialysis.

Original language	English
Journal	Iranian Journal of Kidney Diseases
Volume	5
Issue number	3
Pages (from-to)	175-81
Number of pages	7
ISSN	1735-8582
Publication status	Published - Jul 2011

Keywords

Female
Humans
Iran
Kidney Failure, Chronic
Male
Middle Aged
Patient Satisfaction
Psychometrics
Quality of Life
Renal Dialysis
Reproducibility of Results
Surveys and Questionnaires
Comparative Study
Journal Article
Multicenter Study
Validation Studies

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title = "Validity and reliability of short form-12 questionnaire in Iranian hemodialysis patients",

abstract = "INTRODUCTION: The aim of the study was to assess the validity and reliability of the SF-12 questionnaire in a sample of Iranian patients undergoing hemodialysis.MATERIALS AND METHODS: One hundred and forty-four hemodialysis patients were included from dialysis centers in Zanjan, Iran, and were asked to complete the SF-12 and SF-36 questionnaires. An initial test-retest reliability evaluation was performed on a sample of 70 patients from the total group, with a retest interval of 14 days. Reliability was estimated by internal consistency and validity was assessed using known-group comparisons and construct validity on the patient group as a whole. A linear regression analysis was used to assess any variation in the physical component summary and mental component summary scores of the SF-36 with the respective component summary scores of the SF-12. In addition, the factor structure of the questionnaire was extracted by performing a confirmatory factor analysis.RESULTS: Cronbach alpha for physical and mental component summaries were 0.89 and 0.90, respectively. The SF-12 showed a good discriminatory ability between subgroups of patients based on demographic and clinical variables. The confirmatory factor analysis for the original two-factor structure showed a good fit index (chi2 = 23.30, degrees of freedom = 13), goodness-of-fit index = 0.96, and root mean squared error of approximation = 0.079).CONCLUSIONS: In general, the SF-12 has good psychometric properties and can be used as a shorter version of the SF-36 questionnaire in future studies involving Iranian patients undergoing hemodialysis.",

keywords = "Female, Humans, Iran, Kidney Failure, Chronic, Male, Middle Aged, Patient Satisfaction, Psychometrics, Quality of Life, Renal Dialysis, Reproducibility of Results, Surveys and Questionnaires, Comparative Study, Journal Article, Multicenter Study, Validation Studies",

author = "Pakpour, {Amir H.} and Saeedeh Nourozi and Stig Molsted and Harrison, {Adrian P} and Khadije Nourozi and Bengt Fridlund",

year = "2011",

month = jul,

language = "English",

volume = "5",

pages = "175--81",

journal = "Iranian Journal of Kidney Diseases",

issn = "1735-8582",

publisher = "Iranian Society of Nephrology",

number = "3",

}

TY - JOUR

T1 - Validity and reliability of short form-12 questionnaire in Iranian hemodialysis patients

AU - Pakpour, Amir H.

AU - Nourozi, Saeedeh

AU - Molsted, Stig

AU - Harrison, Adrian P

AU - Nourozi, Khadije

AU - Fridlund, Bengt

PY - 2011/7

Y1 - 2011/7

N2 - INTRODUCTION: The aim of the study was to assess the validity and reliability of the SF-12 questionnaire in a sample of Iranian patients undergoing hemodialysis.MATERIALS AND METHODS: One hundred and forty-four hemodialysis patients were included from dialysis centers in Zanjan, Iran, and were asked to complete the SF-12 and SF-36 questionnaires. An initial test-retest reliability evaluation was performed on a sample of 70 patients from the total group, with a retest interval of 14 days. Reliability was estimated by internal consistency and validity was assessed using known-group comparisons and construct validity on the patient group as a whole. A linear regression analysis was used to assess any variation in the physical component summary and mental component summary scores of the SF-36 with the respective component summary scores of the SF-12. In addition, the factor structure of the questionnaire was extracted by performing a confirmatory factor analysis.RESULTS: Cronbach alpha for physical and mental component summaries were 0.89 and 0.90, respectively. The SF-12 showed a good discriminatory ability between subgroups of patients based on demographic and clinical variables. The confirmatory factor analysis for the original two-factor structure showed a good fit index (chi2 = 23.30, degrees of freedom = 13), goodness-of-fit index = 0.96, and root mean squared error of approximation = 0.079).CONCLUSIONS: In general, the SF-12 has good psychometric properties and can be used as a shorter version of the SF-36 questionnaire in future studies involving Iranian patients undergoing hemodialysis.

AB - INTRODUCTION: The aim of the study was to assess the validity and reliability of the SF-12 questionnaire in a sample of Iranian patients undergoing hemodialysis.MATERIALS AND METHODS: One hundred and forty-four hemodialysis patients were included from dialysis centers in Zanjan, Iran, and were asked to complete the SF-12 and SF-36 questionnaires. An initial test-retest reliability evaluation was performed on a sample of 70 patients from the total group, with a retest interval of 14 days. Reliability was estimated by internal consistency and validity was assessed using known-group comparisons and construct validity on the patient group as a whole. A linear regression analysis was used to assess any variation in the physical component summary and mental component summary scores of the SF-36 with the respective component summary scores of the SF-12. In addition, the factor structure of the questionnaire was extracted by performing a confirmatory factor analysis.RESULTS: Cronbach alpha for physical and mental component summaries were 0.89 and 0.90, respectively. The SF-12 showed a good discriminatory ability between subgroups of patients based on demographic and clinical variables. The confirmatory factor analysis for the original two-factor structure showed a good fit index (chi2 = 23.30, degrees of freedom = 13), goodness-of-fit index = 0.96, and root mean squared error of approximation = 0.079).CONCLUSIONS: In general, the SF-12 has good psychometric properties and can be used as a shorter version of the SF-36 questionnaire in future studies involving Iranian patients undergoing hemodialysis.

KW - Female

KW - Humans

KW - Iran

KW - Kidney Failure, Chronic

KW - Male

KW - Middle Aged

KW - Patient Satisfaction

KW - Psychometrics

KW - Quality of Life

KW - Renal Dialysis

KW - Reproducibility of Results

KW - Surveys and Questionnaires

KW - Comparative Study

KW - Journal Article

KW - Multicenter Study

KW - Validation Studies

M3 - Journal article

C2 - 21525577

SN - 1735-8582

VL - 5

SP - 175

EP - 181

JO - Iranian Journal of Kidney Diseases

JF - Iranian Journal of Kidney Diseases

IS - 3

ER -

Validity and reliability of short form-12 questionnaire in Iranian hemodialysis patients

Abstract

Keywords

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