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Table 1 Pre-trauma Predictor Variable Means and SDs for Individuals Exposed to a Traumatic Event (N = 99)

From: Predicting post-trauma stress symptoms from pre-trauma psychophysiologic reactivity, personality traits and measures of psychopathology

Variable

M

SD

Psychometric Measures

  

SCL-90-R GSI

0.3

0.4

BDI

2.5

3.2

WAIS-R EST-IQ

101.8

10.0

STAI-T

31.2

8.2

NEO-PI-R Domain

  

 Neuroticism

46.7

8.0

 Extroversion

54.7

8.2

 Openness

48.0

11.3

 Agreeableness

48.0

9.4

Loud-tone Psychophysiologic Measures

  

Heart rate

  

 Pre-tone level (bpm)

71.6

11.6

 Mean response (√bpm)

0.6

0.9

 Response slope

0.1

1.0

Skin conductance

  

 Pre tone level (μS)

7.2

5.6

 Mean response (√μS)

0.6

0.3

 Response slope

-0.4

0.2

 Trials to criterion

9.7

4.2

Electromyogram

  

 Mean response (√μV)

2.3

1.7

Fear-conditioning Psychophysiologic Measures

  

SC Orienting Response

0.6

0.7

Differential Response

  

 Acquisition Phase

  

  SC (μS)

0.2

0.5

  EMG (μv)

0.2

2.9

  HR (bpm)

1.0

5.7

 Extinction Phase

  

  SC (μS)

-0.1

0.5

  EMG (μV)

-0.7

4.4

Response to CS + trials

  

 Acquisition Phase

  

  SC (μS)

0.6

0.6

  EMG (μv)

2.5

3.0

  HR (bpm)

5.8

4.8

 Extinction Phase

  

  SC (μS)

0.2

0.4

  EMG (μV)

3.1

4.2

  1. Note: SCL-90-R GSI = Symptom Checklist 90-Revised, Global Severity Score; BDI = Beck Depression Inventory; WAIS-R EST-IQ = Estimated WAIS-R Full Scale IQ from Shipley Institute of Living Scale; STAI-S = State/Trait Anxiety Inventory-State score; bpm = beats per minute; S = Siemens; V = volts; SC = skin conductance; HR = heart rate; Orienting Response = mean response to first presentation of the CS + and the CS- during the habituation phase; Acquisition and extinction response to CS + trials = mean response to CS + trials during the acquisition and extinction phases, respectively; habituation, acquisition, and extinction differential responses = the mean CS interval response to CS + trials minus the mean CS interval response to CS- trials for the habituation, acquisition, and extinction phases, respectively; CS = conditioned stimulus.