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Comparison of IRD values of two states at different measuring points.
| Measuring point | Resting state (cm) | Sit-up state (cm) | t value | P value |
|---|---|---|---|---|
| Point 1 | 2.59 ± 0.99 | 2.10 ± 0.85 | 22.579 | ≤0.001 |
| Point 2 | 3.48 ± 1.05 | 2.68 ± 0.84 | 26.354 | ≤0.001 |
| Point 3 | 4.31 ± 1.07 | 2.99 ± 0.92 | 34.770 | ≤0.001 |
| Point 4 | 2.51 ± 1.26 | 1.62 ± 0.96 | 24.378 | ≤0.001 |
Data are present as mean ± SD. Point 1, 6 cm above the umbilicus; point 2, 3 cm above the umbilicus; point 3, umbilicus; and point 4, 3 cm below the umbilicus.
