Aim: A study was made of the psychometric characteristics of the modified Freedman questionnaire to assess sleep in critical patients.
Design: A psychometric study was carried out, with content validity being explored by a group of experts, and internal consistency based on Cronbach's alpha coefficient. Factor analysis was performed to explore construct validity, and stability was assessed by test-retest analysis.
Setting: The Department of Intensive Care Medicine of a reference hospital.
Participants: Patients admitted between 23 February 2016 and 20 December 2017.
Interventions: Questionnaire administration.
Variables: Items of the modified Freedman questionnaire.
Results: Item relevance and definition yielded scores >3 (Likert scale maximum=4). Cronbach's alpha showed a global value of 0.933. The intraclass correlation index was >0.75 for most of the items of the questionnaire. Factor analysis allowed the detection of specific associations between the studied variables and the four factors.
Conclusions: The modified Freedman questionnaire showed good psychometric characteristics. It may be a reliable instrument for assessing the quality of sleep in critically ill patients, as well as the environmental factors.
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| http://dx.doi.org/10.1016/j.medin.2019.04.006 | DOI Listing |
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