CPR performance for untrained and trained rescuers. Rescuers performed CPR twice, once with and once without audio prompts. Data are given as mean (SD)
| Attempt number | Untrained rescuer | Trained rescuer | ||
|---|---|---|---|---|
| 1 | 2 | 1 | 2 | |
| *Indicates significant difference (p<0.05) between attempt 1 and attempt 2 within a group (either prompts first or no prompts first) with **indicating p <0.01 and ***p<0.001, paired t test. †Indicates significant difference (p<0.05) between groups (prompts first compared with no prompts first), with ††indicating p<0.01 and †††p<0.001, unpaired t test. ‡Indicates significant difference (p <0.05) between untrained and trained rescuers within a group (either prompts first or no prompts first) for a given attempt, with ‡‡indicates p<0.01, paired t test. | ||||
| % Compressions correct depth: | ||||
| Prompts first | 34.4 (35.7) | 42.9 (36.0) | 42.2 (35.2) | 46.7 (36.2) |
| No prompts first | 36.0 (33.3) | 30.7 (31.3) | 36.6 (32.0) | 39.2 (31.1) |
| % Compressions correct hand position: | ||||
| Prompts first | 76.0 (35.6) | 69.6 (40.4) | 79.9 (25.6) | 85.7 (20.4) |
| No prompts first | 54.1 (44.2) | 67.8 (42.7) | 81.1 (27.9) | 71.7 (36.3) |
| % Correct compressions (position and depth): | ||||
| Prompts first | 18.8 (27.2) | 25.7 (32.5) | 25.2 (27.2) | 29.6 (24.6) |
| No prompts first | 24.5 (32.2) | 23.3 (29.4) | 16.7 (23.9) | 25.4 (33.6) |
| Mean compression rate: | ||||
| Prompts first | 87.3 (19.4) | 86.2 (19.9) | 99.0 (3.7)‡ | 99.1 (7.1)‡ |
| No prompts first | 52.3 (31.4)†† | 91.6 (12.1)*** | 94.5 (11.4)‡ | 93.1 (15.2) |
| % Correct ventilations: | ||||
| Prompts first | 51.3 (34.4) | 41.6 (33.3) | 84.8 (22.9)‡‡ | 77.2 (31.0)‡‡ |
| No prompts first | 15.3 (32.8)†† | 47.2 (40.0)** | 55.5 (43.3)‡‡ | 65.8 (36.5)‡‡ |