Supportive Care in Cancer

, 17:1455 | Cite as

Is my patient suffering clinically significant emotional distress? Demonstration of a probabilities approach to evaluating algorithms for screening for distress

  • Kerrie Clover
  • Gregory Leigh Carter
  • Andrew Mackinnon
  • Catherine Adams
Original Article

Abstract

Goals of work

Screening oncology patients for clinically significant emotional distress is a recommended standard of care in psycho-oncology. However, principles regarding the interpretation of screening and diagnostic tests developed in other areas of medicine have not been widely applied in psycho-oncology. This paper explores the application of the concepts of likelihood ratios and post-test probabilities to the interpretation of psychological screening instruments and demonstrates the development of an algorithm for screening for emotional distress and common psychopathology.

Materials and methods

Three hundred forty oncology/haematology outpatients at the Calvary Mater Newcastle, Australia completed the Distress Thermometer (DT), the PSYCH-6 subscale of the Somatic and Psychological Health Report and the Kessler-10 scale. The Hospital Anxiety and Depression Scale (HADS) (cutoff 15+) was used as the gold standard.

Main results

Likelihood ratios showed that a score over threshold on the DT was 2.77 times more likely in patients who were cases on the HADS. These patients had a 53% post-test probability of being cases on the HADS compared with the pretest probability of 29%. Adding either the PSYCH-6 (3+) or the Kessler-10 (22+) to the DT (4+) significantly increased this post-test probability to 94% and 92%, respectively. The significance of these improvements was confirmed by logistic regression analysis.

Conclusions

This study demonstrated the application of probability statistics to develop an algorithm for screening for distress in oncology patients. In our sample, a two-stage screening algorithm improved appreciably on the performance of the DT alone to identify distressed patients. Sequential administration of a very brief instrument followed by selective use of a longer inventory may save time and increase acceptability.

Keywords

Cancer Oncology Screening Emotional distress Depression Anxiety 

Notes

Acknowledgements

The authors wish to thank Mr. Stuart Allen for devising the computerised versions of the questionnaires and data support, Dr. Heidi Reichler for extracting clinical information, Ms. Cynthia Millar for assistance with the statistical analysis, staff and volunteers in the outpatients' department for their support of the project and the research assistants Ms. Danielle Anthony, Ms. Neta Moses and Mr. Jason O'Connor.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Kerrie Clover
    • 1
    • 2
  • Gregory Leigh Carter
    • 1
    • 2
  • Andrew Mackinnon
    • 3
  • Catherine Adams
    • 1
    • 2
    • 4
  1. 1.Psycho-Oncology ServiceCalvary Mater NewcastleNewcastleAustralia
  2. 2.Centre for Brain and Mental HealthUniversity of NewcastleNewcastleAustralia
  3. 3.ORYGEN Research CentreUniversity of MelbourneParkvilleAustralia
  4. 4.School of Psychology, Faculty of Science and Information TechnologyUniversity of NewcastleNewcastleAustralia

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