Aims and predictions

The primary aim was to examine the extent to which obsessions, compulsions, and comorbid depression influence the quality of life in people with OCD.

Key predictions

• The severity of obsessions and compulsions would directly affect QOL ratings, with more severe symptoms leading to poorer QOL.
• The presence of depression would have a negative impact on QOL.

Participants

The sample consisted of 43 individuals aged between 18 and 65 years, all diagnosed with OCD according to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV).

Inclusion and exclusion criteria

• Inclusion - Participants needed to have clinically significant obsessive and compulsive symptoms.
• Exclusion - Individuals were not included if they had concurrent diagnoses of schizophrenia, bipolar disorder, or current substance use disorder.

Procedure

Participants completed a series of self-report questionnaires to assess their symptoms and quality of life.

Measures used

• Yale Brown Obsessive Compulsive Scale (YBOCS) - A 10-item questionnaire assessing the severity of obsessions and compulsions. Each item is rated on a five-point Likert scale from 0 (no symptoms) to 4 (severe symptoms).
• Illness Intrusiveness Rating Scale (IIRS) - Measures how much symptoms interfere with 13 important life domains, such as health, diet, and work. Ratings are on a seven-point Likert scale from 1 (not very much) to 7 (very much).
• Beck Depression Inventory (BDI) - A 21-item self-report scale assessing the severity of depressive symptoms, with each item rated on a four-point scale.

Participants filled out these scales to provide data on their symptom severity and perceived impact on QOL.

Results

• Obsession severity - This significantly predicted poorer QOL.
• Compulsion severity - This did not significantly impact QOL ratings.
• Comorbid depression - The severity of depression was the strongest predictor of poor QOL, accounting for 54% of the variance.
• Correlations - There was a significant positive correlation between scores on the YBOCS and IIRS.

These results showed that obsessions and depression, rather than compulsions, were the main factors affecting QOL in OCD.

Conclusions and limitations

The study concluded that treatments for OCD should prioritise targeting obsessions and comorbid depression to improve patients' quality of life.

Limitations

• Correlation does not imply causation - The positive correlations between scales do not establish cause and effect.
• Need for replication - The findings require confirmation through further studies to draw firmer conclusions.