“…Studies of chest compression-depth and rate in schoolchildren show high deviations [4,29,42–45]. The decisive factor for effective chest compressions with a pressure depth of 5–6 cm seems to be a sufficient body weight of approximately 40–50 kg, which is usually reached earlier in boys than in girls [5 ▪▪ ,28,46]. However, large differences in the thoracic resistance of resuscitation manikins from different manufacturers impede teaching CPR to schoolchildren and evaluating the learning success respectively [5 ▪▪ ,47].…”