Figure 1. Effect sizes (Cohen's d) for the three group contrasts during baseline for all primary measures. ESI = electrodermal sympathetic index (sum of standardized skin conductance level, amplitude and number of nonspecific skin conductance fluctuations); HP = heart period; RSA = respiratory sinus arrhythmia; Pco₂ = end-tidal partial pressure of expired CO₂; CSI = cardiovascular sympathetic index (sum of standardized T-wave amplitude, pulse wave transit time and pulse wave amplitude); PTSD = posttraumatic stress disorder; PD = panic disorder; HC = healthy control group. ¹Interpretation of effect sizes according to Cohen (58).