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Table 4 Internal consistency estimates of the different CoPaQ subscales based on McDonald’s Omega and Cronbach’s Alpha in our three samples

From: The COVID-19 Pandemic Mental Health Questionnaire (CoPaQ): psychometric evaluation and compliance with countermeasures in psychiatric inpatients and non-clinical individuals

  Derivation sample Longitudinal validation sample Psychiatric validation sample
Subscale ω α ω α ω α
COVID-19 contamination anxiety 0.79 0.78 0.79 0.77 0.77 0.77
COVID-19 hygiene measures 0.83 0.83 0.86 0.84 0.81 0.81
COVID-19 social distancing 0.88 0.87 0.87 0.87 0.76 0.75
COVID-19 anxiety buying 0.86 0.85 0.88 0.87 0.93 0.92
COVID-19 political restrictions 0.88 0.88 0.86 0.86 0.90 0.90
COVID-19 solidarity-based behaviours 0.82 0.82 0.87 0.86 0.81 0.81
COVID-19 countermeasure compliance n.a. n.a. n.a. n.a. n.a. n.a.
COVID-19 PTSD symptoms 0.78 0.78 0.83 0.81 0.82 0.82
COVID-19 sleep disturbance 0.83 0.81 0.87 0.85 0.85 0.84
COVID-19 substance abuse 0.77 0.75 0.80 0.77 0.76 0.74
COVID-19-specific stressor impact n.a. n.a. n.a. n.a. n.a. n.a.
COVID-19 daytime structure 0.72 0.69 0.76 0.75 0.80 0.79
COVID-19 social contacts n.a. n.a. n.a. n.a. n.a. n.a.
COVID-19 inner strength n.a. n.a. n.a. n.a. n.a. n.a.
COVID-19 institutional & political trust 0.87 0.86 0.88 0.88 0.81 0.79
COVID-19 conspiracy beliefs 0.82 0.82 0.79 0.78 0.90 0.89
COVID-19 social cohesion 0.80 0.79 0.77 0.76 n.a. n.a.
  1. ω indicates McDonald’s Omega. α indicates Cronbach’s Alpha
  2. n.a. not applicable