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Differential environmental factors in anorexia nervosa: a sibling pair study
F Murphy1, N A Troop, J L Treasure
1Eating Disorders Unit, Institute of Psychiatry, London, UK. F.M.Murphy@rhbnc.ac.uk
The British Journal of Clinical Psychology
|July 15, 2000
Summary
Women with anorexia nervosa perceived greater maternal control and sibling antagonism than their unaffected sisters. They also reported fewer friendships and romantic relationships, highlighting unique environmental influences.
Area of Science:
- Psychiatry
- Psychology
- Behavioral Genetics
Background:
- Previous research on anorexia nervosa (AN) often used between-group comparisons.
- This study investigates familial and psychosocial environmental factors in AN development.
- Focuses on unique environmental experiences within sister pairs.
Purpose of the Study:
- To explore environmental antecedents of anorexia nervosa.
- To compare psychosocial and familial factors in discordant sister pairs (one with AN, one without).
- To identify non-shared environmental experiences contributing to AN.
Main Methods:
- Utilized a paired design comparing women with AN to their unaffected sisters.
- Employed the Sibling Inventory of Differential Experience (SIDE) to assess non-shared environment.
- Sample comprised 28 women with AN and their healthy sisters, selected from an initial 148 AN cases.
Main Results:
- Women with AN reported higher levels of perceived maternal control compared to their unaffected sisters.
- Anorexic sisters experienced more antagonism and jealousy towards their siblings.
- Individuals with AN reported fewer friendships and romantic relationships than their sisters.
Conclusions:
- Confirms perceived environmental differences between sisters discordant for AN.
- Findings suggest implications for understanding family dynamics and psychosexual development in AN.
- Highlights the role of non-shared environmental factors in AN etiology.