Psychometric evaluation and feasibility of the Greek Pittsburgh Sleep Quality Index (GR-PSQI) in patients with cancer receiving chemotherapy

Grigorios C Kotronoulas, Constantina N Papadopoulou, Anastasia Papapetrou, Elisabeth Patiraki

Research output: Contribution to journalArticle

Abstract

PURPOSE: Quality of sleep in patients with cancer is regarded as of utmost importance. The aim of the present study was to assess psychometric properties and feasibility of the Greek version of the Pittsburgh Sleep Quality Index (GR-PSQI).

METHODS: Following a "forward-backward" procedure, the scale was translated into Greek. The GR-PSQI was administered as a self-report instrument to 209 consecutive patients with cancer during active-phase chemotherapy treatment. For stability analysis purposes, a subgroup of 60 patients completed the GR-PSQI on two occasions, 14-21 days apart. All participants also completed the Insomnia Severity Index, the Epworth Sleepiness Scale-Greek version, a Sleep Quality-Visual Analogue Scale and the Hospital Anxiety and Depression Scale-Greek version. Validity and reliability analyses were performed for GR-PSQI data.

RESULTS: The Chronbach's alpha for the global GR-PSQI score was 0.76. Test-retest reliability analysis for the global GR-PSQI score yielded a high intra-class correlation coefficient of 0.82 (p < 0.001). Exploratory factor analysis generated a two-factor structure for the GR-PSQI, [quality of nocturnal sleep] and [daily disturbances and management of sleep problems]. This construct was further supported by its high correlations with similar content instruments, as well as by the instrument's ability to discriminate well between contrasting groups of patients with different levels of anxiety, depression and performance status.

CONCLUSIONS: The present findings support the GR-PSQI as a reliable, stable over time and valid sleep quality instrument when administered to patients with cancer during chemotherapy treatment; however, it is suggested that the use of a two-factor scoring method (instead of the traditional unidimensional) could improve its sensitivity in this patient group.

Original languageEnglish
Pages (from-to)1831-40
Number of pages10
JournalSupportive Care in Cancer
Volume19
Issue number11
DOIs
Publication statusPublished - Nov 2011
Externally publishedYes

Fingerprint

Psychometrics
Sleep
Drug Therapy
Neoplasms
Reproducibility of Results
Anxiety
Depression
Aptitude
Sleep Initiation and Maintenance Disorders
Visual Analog Scale
Self Report
Statistical Factor Analysis
Research Design

Keywords

  • Adult
  • Aged
  • Aged, 80 and over
  • Antineoplastic Agents
  • Anxiety
  • Depression
  • Feasibility Studies
  • Female
  • Humans
  • Male
  • Middle Aged
  • Neoplasms
  • Prospective Studies
  • Psychometrics
  • Reproducibility of Results
  • Severity of Illness Index
  • Sleep
  • Sleep Initiation and Maintenance Disorders
  • Young Adult
  • Journal Article
  • Validation Studies

Cite this

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title = "Psychometric evaluation and feasibility of the Greek Pittsburgh Sleep Quality Index (GR-PSQI) in patients with cancer receiving chemotherapy",
abstract = "PURPOSE: Quality of sleep in patients with cancer is regarded as of utmost importance. The aim of the present study was to assess psychometric properties and feasibility of the Greek version of the Pittsburgh Sleep Quality Index (GR-PSQI).METHODS: Following a {"}forward-backward{"} procedure, the scale was translated into Greek. The GR-PSQI was administered as a self-report instrument to 209 consecutive patients with cancer during active-phase chemotherapy treatment. For stability analysis purposes, a subgroup of 60 patients completed the GR-PSQI on two occasions, 14-21 days apart. All participants also completed the Insomnia Severity Index, the Epworth Sleepiness Scale-Greek version, a Sleep Quality-Visual Analogue Scale and the Hospital Anxiety and Depression Scale-Greek version. Validity and reliability analyses were performed for GR-PSQI data.RESULTS: The Chronbach's alpha for the global GR-PSQI score was 0.76. Test-retest reliability analysis for the global GR-PSQI score yielded a high intra-class correlation coefficient of 0.82 (p < 0.001). Exploratory factor analysis generated a two-factor structure for the GR-PSQI, [quality of nocturnal sleep] and [daily disturbances and management of sleep problems]. This construct was further supported by its high correlations with similar content instruments, as well as by the instrument's ability to discriminate well between contrasting groups of patients with different levels of anxiety, depression and performance status.CONCLUSIONS: The present findings support the GR-PSQI as a reliable, stable over time and valid sleep quality instrument when administered to patients with cancer during chemotherapy treatment; however, it is suggested that the use of a two-factor scoring method (instead of the traditional unidimensional) could improve its sensitivity in this patient group.",
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Psychometric evaluation and feasibility of the Greek Pittsburgh Sleep Quality Index (GR-PSQI) in patients with cancer receiving chemotherapy. / Kotronoulas, Grigorios C; Papadopoulou, Constantina N; Papapetrou, Anastasia; Patiraki, Elisabeth.

In: Supportive Care in Cancer, Vol. 19, No. 11, 11.2011, p. 1831-40.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Psychometric evaluation and feasibility of the Greek Pittsburgh Sleep Quality Index (GR-PSQI) in patients with cancer receiving chemotherapy

AU - Kotronoulas, Grigorios C

AU - Papadopoulou, Constantina N

AU - Papapetrou, Anastasia

AU - Patiraki, Elisabeth

PY - 2011/11

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N2 - PURPOSE: Quality of sleep in patients with cancer is regarded as of utmost importance. The aim of the present study was to assess psychometric properties and feasibility of the Greek version of the Pittsburgh Sleep Quality Index (GR-PSQI).METHODS: Following a "forward-backward" procedure, the scale was translated into Greek. The GR-PSQI was administered as a self-report instrument to 209 consecutive patients with cancer during active-phase chemotherapy treatment. For stability analysis purposes, a subgroup of 60 patients completed the GR-PSQI on two occasions, 14-21 days apart. All participants also completed the Insomnia Severity Index, the Epworth Sleepiness Scale-Greek version, a Sleep Quality-Visual Analogue Scale and the Hospital Anxiety and Depression Scale-Greek version. Validity and reliability analyses were performed for GR-PSQI data.RESULTS: The Chronbach's alpha for the global GR-PSQI score was 0.76. Test-retest reliability analysis for the global GR-PSQI score yielded a high intra-class correlation coefficient of 0.82 (p < 0.001). Exploratory factor analysis generated a two-factor structure for the GR-PSQI, [quality of nocturnal sleep] and [daily disturbances and management of sleep problems]. This construct was further supported by its high correlations with similar content instruments, as well as by the instrument's ability to discriminate well between contrasting groups of patients with different levels of anxiety, depression and performance status.CONCLUSIONS: The present findings support the GR-PSQI as a reliable, stable over time and valid sleep quality instrument when administered to patients with cancer during chemotherapy treatment; however, it is suggested that the use of a two-factor scoring method (instead of the traditional unidimensional) could improve its sensitivity in this patient group.

AB - PURPOSE: Quality of sleep in patients with cancer is regarded as of utmost importance. The aim of the present study was to assess psychometric properties and feasibility of the Greek version of the Pittsburgh Sleep Quality Index (GR-PSQI).METHODS: Following a "forward-backward" procedure, the scale was translated into Greek. The GR-PSQI was administered as a self-report instrument to 209 consecutive patients with cancer during active-phase chemotherapy treatment. For stability analysis purposes, a subgroup of 60 patients completed the GR-PSQI on two occasions, 14-21 days apart. All participants also completed the Insomnia Severity Index, the Epworth Sleepiness Scale-Greek version, a Sleep Quality-Visual Analogue Scale and the Hospital Anxiety and Depression Scale-Greek version. Validity and reliability analyses were performed for GR-PSQI data.RESULTS: The Chronbach's alpha for the global GR-PSQI score was 0.76. Test-retest reliability analysis for the global GR-PSQI score yielded a high intra-class correlation coefficient of 0.82 (p < 0.001). Exploratory factor analysis generated a two-factor structure for the GR-PSQI, [quality of nocturnal sleep] and [daily disturbances and management of sleep problems]. This construct was further supported by its high correlations with similar content instruments, as well as by the instrument's ability to discriminate well between contrasting groups of patients with different levels of anxiety, depression and performance status.CONCLUSIONS: The present findings support the GR-PSQI as a reliable, stable over time and valid sleep quality instrument when administered to patients with cancer during chemotherapy treatment; however, it is suggested that the use of a two-factor scoring method (instead of the traditional unidimensional) could improve its sensitivity in this patient group.

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KW - Feasibility Studies

KW - Female

KW - Humans

KW - Male

KW - Middle Aged

KW - Neoplasms

KW - Prospective Studies

KW - Psychometrics

KW - Reproducibility of Results

KW - Severity of Illness Index

KW - Sleep

KW - Sleep Initiation and Maintenance Disorders

KW - Young Adult

KW - Journal Article

KW - Validation Studies

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JO - Supportive Care in Cancer

JF - Supportive Care in Cancer

SN - 0941-4355

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