Linear mixed model for a repeated measures covariance pattern model with unstructured covariance within participants
| Position | Right-handedestimated mean (SE) | Left-handed estimated mean (SE) | p Value | ||
|---|---|---|---|---|---|
| Handedness | Directions | Handedness×direction | |||
| Compression depth (mm) | |||||
| Lap/Lst | 44.7 (1.7) | 36.1 (3.2) | 0.022 | <0.001 | 0.090* |
| Lap/Rst | 41.8 (1.8) | 35.4 (3.3) | |||
| Rap/Lst | 38.7 (1.8)* | 27.4 (3.3)* | |||
| Rap/Rst | 41.5 (1.7) | 35.9 (3.2) | |||
| Mean compression rate (compressions/min) | |||||
| Lap/Lst | 132.2 (7.1) | 142.6 (13.2) | 0.131 | 0.019 | 0.967 |
| Lap/Rst | 122.2 (3.1) | 131.3 (5.7) | |||
| Rap/Lst | 116.1 (3.1)* | 127.3 (5.6) | |||
| Rap/Rst | 115.3 (3.2) | 124.6 (6.0) | |||
| Total compression | |||||
| Lap/Lst | 247.4 (6.3) | 257.9 (11.5) | 0.142 | 0.011 | 0.635 |
| Lap/Rst | 248.7 (6.0) | 264.9 (11.1) | |||
| Rap/Lst | 234.5 (6.1)* | 257.5 (11.3) | |||
| Rap/Rst | 233.9 (6.5) | 251.0 (12.0) | |||
| Corrected hand placement (%) | |||||
| Lap/Lst | 89.4 (4.2) | 85.0 (7.7) | 0.153 | 0.7339 | 0.075* |
| Lap/Rst | 94.3 (4.1) | 67.4 (7.5)* | |||
| Rap/Lst | 84.9 (4.5) | 87.8 (8.3) | |||
| Rap/Rst | 88.5 (4.3) | 79.1 (8.0) | |||
Lap/Lst, chest compression on the manikin's left side of approach with their left hand in contact with the sternum; Lap/Rst, chest compression on the manikin's left side with their right hand down; Rap/Lst, chest compression on the manikin's right side with their left hand down; Rap/Rst, chest compression on the manikin's right side with their right hand down.
*Significant interaction between Handedness × direction (p<0.10 is considered statistically significant).