Table 1

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

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.

Orr et al.

Orr et al. Biology of Mood & Anxiety Disorders 2012 2:8   doi:10.1186/2045-5380-2-8

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