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Measuring reliability and validity of a newly developed stress instrument: N ewly D iagnosed B reast C ancer S tress S cale
Author(s) -
Lee TsoYing,
Chen HsingHsia,
Yeh MeiLing,
Li HuiLing,
Chou KueiRu
Publication year - 2013
Publication title -
journal of clinical nursing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.94
H-Index - 102
eISSN - 1365-2702
pISSN - 0962-1067
DOI - 10.1111/jocn.12107
Subject(s) - cronbach's alpha , convergent validity , construct validity , content validity , varimax rotation , distress , anxiety , breast cancer , psychology , exploratory factor analysis , medicine , clinical psychology , psychometrics , psychiatry , cancer , internal consistency
Aims and objectives To assess the reliability and validity of a developed instrument entitled Newly Diagnosed Breast Cancer Stress Scale. Background Distress, clinical anxiety and depression are evident in patients with cancer, leading to poor psychosocial and quality‐of‐life outcomes. Design Instrument development study with norm‐referenced measurements. Methods Content validity was determined by expert review. C ronbach's α was used to assess internal consistency reliability and product‐moment correlations were conducted. Exploratory factor analysis measured validity of items using varimax rotation method. Criterion‐related validity testing used the Perceived Stress Scale and the convergent validity test of construct validity used the H ospital A nxiety and D epression S cale. A total of 125 women pathologically diagnosed with breast cancer were interviewed on the day prior to initial breast surgery. Results After testing, the N ewly D iagnosed B reast C ancer S tress S cale consisted of four main factors with 17 items with acceptable reliability and good validity, and its length and time to complete the questionnaire were appropriate. Internal consistency reliability of the scale was shown by C ronbach's α = 0·84, the criterion validity of P erceived S tress S cale‐10 was r = 0·46 ( p < 0·001), the convergent validity of H ospital A nxiety and D epression S cale‐14 was r = 0·57 ( p < 0·001) for anxiety and r = 0·35 ( p < 0·001) for depression. Conclusions The N ewly D iagnosed B reast C ancer S tress S cale has acceptable reliability and good validity to measure stress in newly diagnosed patients with breast cancer. Relevance to clinical practice The N ewly D iagnosed B reast C ancer S tress S cale can provide healthcare workers with an instrument to better identify stress levels in newly diagnosed breast cancer patients and provide valuable information when defining psychosocial care interventions.