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. 2019 May 31;19:180. doi: 10.1186/s12909-019-1626-7

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Ventilation quality. a Mean ventilations per minute (intervention group 2.8 ± 0.8 min^− 1,control group 3.9 ± 0.9 min^− 1; Follow-up: intervention 2.7 ± 1.0 min^− 1, control group 3.2 ± 1.0 min^− 1) b Mean compression pause for ventilation (intervention group 4.4(3.8/5.4)sec., control group 5.3(4.5/6.1)sec.; Follow-up: intervention 4.4(3.8/4.8)sec., control group 5.1(4.9/5.9)sec.) c Percentage of accurate ventilations (intervention group 23.2(0/35.2%)%,control group 29.0(13.2/40.7)%; Follow-up: intervention 19.4(3.4/25.0)%, control group 15.9(0/36.4)%) d Mean ventilation tidal volume (intervention group 185 ± 155 ml, control group 275 ± 115 ml; Follow-up: intervention 169 ± 97 ml, control group 150 ± 141 ml); (* = p < 0.05)