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Quality of Life Research

, Volume 22, Issue 6, pp 1255–1263 | Cite as

Quality of life of childbearing age women and its associated factors: an application of seemingly unrelated regression (SUR) models

  • Sareh Keshavarzi
  • Seyyed Mohammad Taghi AyatollahiEmail author
  • Najaf Zare
  • Farkhondeh Sharif
Article

Abstract

Purpose

This article is a report of using seemingly unrelated regression (SUR) models to examine the determinants of different dimensions of quality of life (QoL) among childbearing age women. There are a limited number of studies on QoL and its associated factors among women in developing countries such as Iran. Therefore, more attention should be focused on identifying these issues.

Methods

We administered the Persian’s abbreviated version of the World Health Organization Quality of Life (WHOQOL-BREF) questionnaire to 1,067 married women aged between 15 and 49 years. The women were chosen via a multistage research design from the rural region of Shiraz, the center of Fars Province in Iran in 2008. Clinical and socio-demographic characteristics as well as their reproductive health-related characteristics were investigated. To identify associated factors of QoL dimensions, ordinary least squares (OLS) regression and SUR were used and their findings were compared.

Results

The WHOQOL-BREF showed acceptable consistency (Cronbach’s alpha range: 0.62–0.75 across domains). Lower age, absence of long-term illness, economic status satisfaction, higher level of education, lower number of pregnancies, and higher body mass index were important associated factors of different dimensions of the QoL among these women. The estimated parameters for these factors were in close agreement in both OLS and SUR estimation methods. However, the SUR estimator provided the higher precision of the estimates than the OLS estimator, as the parameters obtained by SUR are characterized by lower standard errors. Women’s age, income satisfaction, and level of education were common for all domains.

Conclusions

This study presents a novel approach to simultaneously predict QoL domains using the SUR estimators and the results are relevant for implementing objective QoL. SUR estimators performed consistently better than the OLS estimators, since SUR takes the correlation between error terms into account. Thus, the SUR method could be a useful methodology for predicting QoL domains.

Keywords

Multivariate regression Ordinary least square Quality of life Rural district Seemingly unrelated regression WHOQOL-BREF 

Abbreviations

BMI

Body mass index

OLS

Ordinary least squares

QoL

Quality of life

SAS

Statistical analysis system

SE

Standard error

SPSS

Statistical package for social sciences

SUR

Seemingly unrelated regression

VIF

Variance inflation factor

WHOQOL-BREF

World Health Organization Quality of Life questionnaire

Notes

Acknowledgments

This article is extracted from a Ph.D dissertation by Sareh Keshavarzi in Biostatistics, Shiraz University of Medical Sciences, Shiraz, Iran. The study was financially supported through the grants from Shiraz University of Medical Sciences.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Sareh Keshavarzi
    • 1
  • Seyyed Mohammad Taghi Ayatollahi
    • 1
    Email author
  • Najaf Zare
    • 1
  • Farkhondeh Sharif
    • 2
  1. 1.Department of BiostatisticsShiraz University of Medical SciencesShirazIran
  2. 2.Faculty of Nursing and MidwiferyShiraz University of Medical ScienceShirazIran

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