Fig. 6From: Chest compression rate measurement from smartphone videoThree test examples, time in seconds, and compression rate in cpm. Blue line corresponds to compression rate from smartphone app, and red line corresponds to reference rate recorded from the manikin. a Test person 2 (long loose hair), target compression rate 110Â cpm. \(\bar{E}\)Â =Â 11.3, PÂ =Â 80.2. b Test person 5 (long loose hair), bad phone placement AND background disturbances. Target rate = 110 cpm. \(\bar{E}\)Â =Â 34.8, PÂ =Â 49.4. c Test person 5 (long loose hair), CPR 30:2. \(\bar{E}\)Â =Â 7.9, PÂ =Â 82.7Back to article page