Defeat Scale [TDS-16]

Description

The Defeat Scale (TDS-16) is a 16-item self-report instrument developed by Gilbert and Allan (1998). It assesses the extent to which an individual has felt defeated, powerless, unsuccessful, or unable to cope during the previous seven days. The concept of defeat involves perceived failure to achieve important goals, loss of social status, and the feeling that efforts to overcome difficulties have been unsuccessful. The scale is grounded in social rank theory and the evolutionary approach to depression.

Aim

The TDS-16 aims to provide a systematic assessment of the subjective experience of defeat. It is commonly used to investigate associations between defeat and depression, entrapment, hopelessness, anxiety, and suicidal ideation. The instrument can be applied in clinical and research settings but should not be used independently as a diagnostic measure.

Data Analysis and Use

Data analysis may include the calculation of the total score, mean, standard deviation, and score distribution. Internal consistency can be evaluated using Cronbach’s alpha or McDonald’s omega. Construct validity may be examined through correlations with related psychological variables, while exploratory or confirmatory factor analysis can be used to evaluate the scale’s factor structure.

Scoring

Participants indicate how frequently they experienced each statement during the previous seven days using a five-point scale:

0 = Never
1 = Seldom
2 = Sometimes
3 = Mostly
4 = Always

Items 2, 4, and 9 are positively worded and must be reverse-scored. The total score is calculated by summing the responses to all 16 items and ranges from 0 to 64. Higher scores indicate a stronger subjective experience of defeat. Results should be interpreted according to the characteristics of the population being assessed, as no universally accepted diagnostic cut-off score has been established.

References

Gilbert, P., & Allan, S. (1998). The role of defeat and entrapment (arrested flight) in depression: An exploration of an evolutionary view. Psychological Medicine, 28(3), 585–598. https://doi.org/10.1017/S0033291798006710

Gilbert, P., Allan, S., Brough, S., Melley, S., & Miles, J. N. V. (2002). Relationship of anhedonia and anxiety to social rank, defeat and entrapment. Journal of Affective Disorders, 71(1–3), 141–151. https://doi.org/10.1016/S0165-0327(01)00392-5