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Table 4 Average error [cpm], \(\mu _{\bar{E}}\) with \(\sigma _{\bar{E}}\,\)in paranthesis, for different disturbances for groups of test persons

From: Chest compression rate measurement from smartphone video

Disturbances Short hair/hair up Short + medium hair Short, medium + long hair
Backgr. dist. 5.1 (0.43) 8.2 (4.2) 18.4 (20.8)
Bad pos. 3.8 (2.65) 4.3 (2.0) 17.1 (29.1)
Dist + bas pos. 7.5 (2.77) 12.5 (9.0) 24.6 (24.8)
30:2 + dist. 18.5 (5.25) 23.6 (7.9) 28.6 (13.7)
Var. light 2.9 (0.96) 12.2 (16.8) 15.0 (17.7)
Other activities 38.1 (13.6) 26.7 (18.7) 28.5 (18.3)
  1. The target rate is 110 cpm, except in the “other activities” test where there is no target compression rate