(14) difficulty concentrating Frequency In the past week, have you found it difficult to concentrate on what you were doing or on things going on around you? Has your concentration changed since the event? How much of the time have you had difficulty concentrating? Intensity How difficult was it for you concentrate? (In rating this item include observations of concentration and attention in the interview) 0 None of the time 1 Very little of the time (less than 10%) 0 1 2 Some of the time (20-30%) 2 3 Much of the time (50-60%) 3 4 Most or all of the time (more than 80%) 4 (15) No difficulty with concentration Mild, only slight effort needed to concentrate Moderate, definite loss of concentration, but could concentrate with effort Severe, marked loss of concentration, even with effort Extreme, complete inability to concentrate hypervigilance Frequency In the past week, have you been especially alert or watchful, even though there was no obvious need to be? Is this different from how you felt or acted before the event? How much of the time have you been alert or watchful? Intensity How much effort did you make to try to be aware of everything around you? (In rating this item include observations of hypervigilance during the interview) 0 None of the time 1 Very little of the time (less than 10%) 0 1 2 Some of the time (20-30%) 2 3 Much of the time (50-60%) 3 4 Most or all of the time (more than 80%) 4 (16) No hypervigilance Mild, minimal hypervigilance, slight heightening of awareness Moderate, hypervigilance clearly present, watchful in public Severe, marked hypervigilance, very alert, scans environment for danger, exaggerated concern for safety of self, home or family Extreme, excessive hypervigilance, efforts to ensure safety consume significant time and energy, and may involve extensive safetychecking behaviours, marked guarded behaviour during interview exaggerated startle response Frequency In the past week, have you experienced strong startle reactions to loud, unexpected noises, or to unexpected things that you saw? Is this different from how you were before the event? How often has this happened? Intensity At their worst, how strong were these startle reactions?