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Table 1 Descriptive statistics of study variables

From: A PTSD symptoms trajectory mediates between exposure levels and emotional support in police responders to 9/11: a growth curve analysis

Variable Mean SD alpha Items Range n
Exposure 1.63 1.62 .78 5 0–5 2,197
Social Support 3.06 1.01 .89 3 0–4 2,184
PCL at Wave 1 25.23 9.39 .92 17 17–85 2,204
PCL at Wave 2 29.47 12.71 .94 17 17–85 2,204
PCL at Wave 3 28.69 12.72 .95 17 17–85 2,204
  1. Note. PCL PTSD checklist of stress symptoms [20]