Gender differences in anxiety: The mediating role of sensitivity to unpredictable threat.

Anxiety disorders and symptoms disproportionately impact women relative to men, but it is unclear what mechanism(s) contribute to this phenomenon. The present study examined sensitivity to unpredictable threat as a potential mechanism of gender differences in panic symptoms. The sample included 67 participants (35 women) who completed the no, predictable, and unpredictable threat (NPU-threat) startle paradigm with electric shocks as the aversive stimulus. Participants also completed the self-report Inventory of Depression and Anxiety Symptoms to assess current panic and depression symptoms. Results indicated that women, relative to men, reported greater panic symptoms and demonstrated increased startle potentiation in anticipation of predictable and unpredictable threat. Furthermore, across all participants increased startle potentiation in anticipation of unpredictable (but not predictable) threat was associated with greater panic symptoms, but there was no relationship with depression symptoms. Finally, the gender difference in panic symptoms was mediated by startle potentiation in anticipation of unpredictable (but not predictable) threat. The present study suggests that a heightened sensitivity to unpredictable threat might be a mechanism that contributes to increased anxiety in women.