Evidence map›Paper›PMID 28455545›Full record

ArticleSupportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer2017

Reliability and validity of the Pittsburgh Sleep Quality Index in breast cancer patients.

Filipa Fontes, Marta Gonçalves, Susana Maia, Susana Pereira, Milton Severo, Nuno Lunet

Erratum issuedAbstract readEvaluation Study
PubMed Publisher
In one paragraph

Article in Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 40 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
40citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

40 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  5. Impact of 8-hour time-limited eating on sleep in adolescents with obesity.Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine · 2023
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  6. Psychometric and Structural Validity of the Pittsburgh Sleep Quality Index among Filipino Domestic Workers.International journal of environmental research and public health · 2020
    Trial
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  15. Sleep quality in cancer patients: a common metric for several instruments measuring sleep quality.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2024
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  17. Observational
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

6 authors.

Filipa FontesISPUP - EPIUnit, Universidade do Porto, Rua das Taipas, 4050-600, Porto, Portugal.
Marta GonçalvesISPUP - EPIUnit, Universidade do Porto, Rua das Taipas, 4050-600, Porto, Portugal.
Susana MaiaCentro de Medicina do Sono - Hospital CUF Porto, Estrada da Circunvalação, 4100-180, Porto, Portugal.
Susana PereiraISPUP - EPIUnit, Universidade do Porto, Rua das Taipas, 4050-600, Porto, Portugal.
Milton SeveroISPUP - EPIUnit, Universidade do Porto, Rua das Taipas, 4050-600, Porto, Portugal.
Nuno LunetISPUP - EPIUnit, Universidade do Porto, Rua das Taipas, 4050-600, Porto, Portugal. nlunet@med.up.pt.

Funding

Fundação para a Ciência e a Tecnologia SFRH/BD/92630/2013
6 · The paper itself

Abstract

purposeWe aimed to assess the factor structure, internal consistency, test-retest reliability, and construct validity of the European Portuguese version of the Pittsburgh Sleep Quality Index (PSQI) in breast cancer patients.

methodsThis study was based on a cohort of breast cancer patients, among whom the PSQI was used to measure sleep quality three years after cancer diagnosis (N = 474). A sample of 62 participants underwent additional PSQI testing, wore a wrist actigraph for five consecutive days, and was reevaluated with the PSQI after one month. A confirmatory factor analysis, considering the components suggested by the principal component analysis (PCA), was performed to determine model fit. To evaluate internal consistency and test-retest reliability, Cronbach's alpha and intraclass correlation coefficient (ICC) were calculated, respectively. To assess construct validity, Spearman's correlation coefficients were computed between PSQI scores and actigraphy measures and other theoretical related constructs.

resultsPCA suggested one or two components. The latter showed better fit to the data, though the two factors were strongly correlated (r = 0.76) and internal consistency was not satisfactory for one of the factors. Regarding the one-factor model, internal consistency (Cronbach's alpha = 0.70) and test-retest reliability (ICC = 0.76) were adequate. Sleep duration, habitual sleep efficiency, and sleep disturbance dimensions were significantly correlated with the corresponding actigraphy measures; the PSQI global score derived from the one-factor model was more strongly correlated with subjective sleep complaints (r ≥ 0.60).

conclusionsThe unidimensional construct of the European Portuguese version of the PSQI showed adequate reliability and validity among breast cancer patients.

Indexed as

Health Status IndicatorsAdultAgedBreast NeoplasmsCohort StudiesFemaleFollow-Up StudiesHumansMiddle AgedPredictive Value of TestsPsychometricsReproducibility of ResultsSleepSleep Wake DisordersSurveys and QuestionnairesActigraphyBreast neoplasmsPrincipal component analysisPsychometricsSleep

Identifiers

PMID28455545

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.