Table 3. Comparisons of two-finger chest compression techniques: index-middle vs. middle-ring fingers.
| Parameters | Right index-middle fingers (n = 30) (95% CI) |
Right middle-ring fingers (n = 30) (95% CI) |
95% CI of the difference | P value | |
|---|---|---|---|---|---|
| Lower limit | Upper limit | ||||
| Mean compression depth (mm) | 39.0 ± 3.3 (37.8 to 40.2) |
36.9 ± 4.5 (35.2 to 38.6) |
NA | NA | 0.002*‡ |
| Deep enough compressions (%) | 78.5 ± 27.5 (68.3 to 88.8) |
62.8 ± 36.4 (49.2 to 76.4) |
NA | NA | 0.001*‡ |
| Total compressions (No.) | 169.6 ± 23.3 (160.9 to 178.3) |
169.9 ± 26.3 (160.1 to 179.7) |
-4.742 | 4.209 | 0.904† |
| Compressions fully released (%) | 82.2 ± 24.0 (73.2 to 91.1) |
83.8 ± 27.1 (73.7 to 93.9) |
NA | NA | 0.543* |
| Mean compression rate (/min) | 119.9 ± 17.3 (113.5 to 126.4) |
119.2 ± 19.0 (112.1 to 126.3) |
-2.988 | 4.388 | 0.701† |
| Hands-off time (sec) | 34.9 ± 5.5 (32.8 to 36.9) |
34.1 ± 5.6 (32.0 to 36.2) |
-0.876 | 2.410 | 0.348† |
| Total ventilations (No.) | 10.2 ± 1.7 (9.6 to 10.9) |
10.1 ± 1.6 (9.5 to 10.7) |
NA | NA | 0.692* |
| Mean volume (mL) | 66.6 ± 31.3 (54.9 to 78.3) |
65.5 ± 36.9 (51.7 to 79.3) |
NA | NA | 0.905* |
| Left index-middle fingers (n = 30) (95% CI) |
Left middle-ring fingers (n = 30) (95% CI) |
||||
| Mean compression depth (mm) | 38.1 ± 3.1 (36.9 to 39.2) |
36.8 ± 3.5 (35.5 to 38.1) |
NA | NA | 0.003*‡ |
| Deep enough compressions (%) | 69.6 ± 32.1 (57.6 to 81.6) |
56.3 ± 33.8 (43.7 to 68.9) |
NA | NA | 0.008*‡ |
| Total compressions (No.) | 167.2 ± 23.0 (158.6 to 175.8) |
166.0 ± 23.4 (157.3 to 174.8) |
-1.567 | 3.900 | 0.390† |
| Compressions fully released (%) | 85.7 ± 19.3 (78.5 to 92.9) |
79.0 ± 31.1 (67.4 to 90.6) |
NA | NA | 0.281* |
| Mean compression rate (/min) | 118.7 ± 17.2 (112.3 to 125.2) |
117.9 ± 18.3 (111.0 to 124.7) |
-1.762 | 3.496 | 0.505† |
| Hands-off time (sec) | 35.0 ± 5.2 (33.1 to 36.9) |
33.9 ± 4.8 (32.1 to 35.7) |
-0.181 | 2.448 | 0.088† |
| Total ventilations (No.) | 10.1 ± 1.6 (9.5 to 10.7) |
9.6 ± 1.8 (8.9 to 10.3) |
NA | NA | 0.227* |
| Mean volume (mL) | 70.8 ± 42.0 (55.1 to 86.5) |
71.4 ± 41.7 (55.8 to 86.9) |
NA | NA | 0.649* |
Data are presented as mean ± SD (95% CI).
N/A, not applicable.
*Statistical significances were tested by Wilcoxon signed rank tests. †Statistical significances were tested by two-sided paired t-tests. ‡Significant P value < 0.05.