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Correlation coefficients for low and high volumes of expired air and the three ultrasound methods to measure diaphragm movement
| Mean | Low volume | High volume | |||||
|---|---|---|---|---|---|---|---|
| Correlation coefficient | 95% CI | p value | Correlation coefficient | 95% CI | p value | ||
| M-mode | 4.49 | 0.85 | (0.74–0.96) | < 0.01 | 0.43 | (0.17–0.68) | < 0.01 |
| Area method | 3.78 | 0.84 | (0.71–0.96) | < 0.01 | 0.29 | (0.07–0.64) | 0.11 |
| B-mode | 3.82 | 0.61 | (0.35–0.86) | < 0.01 | 0.14 | (− 0.19–0.48) | 0.4 |
