Table 1.
Inter-Rectus Distance Measurements Obtained by Each Rater at Four Anatomical Locations at Rest and During Head Lift
| Anatomical measurement site and condition |
Sample size |
Mean (SD) IRD, cm |
|
|---|---|---|---|
| Rater 1 | Rater 2 | ||
| 5ASU | |||
| At rest | 17 | 1.81 (0.85) | 2.24 (0.88) |
| Head lift | 17 | 1.78 (0.84) | 1.97 (0.81) |
| 3ASU | |||
| At rest | 17 | 2.12 (0.83) | 2.39 (0.66) |
| Head lift | 17 | 2.22 (0.88) | 2.08 (0.55) |
| SBU | |||
| At rest | 17 | 2.86 (1.12) | 2.66 (0.73) |
| Head lift | 17 | 2.73 (0.85) | 2.24 (0.65) |
| 3BIU | |||
| At rest | 16 | 1.40 (0.90) | 1.55 (0.76) |
| Head lift | 16 | 1.09 (0.76) | 1.14 (0.58) |
Note: The sample size was reduced to n=16 for measurements made below the umbilicus; Rater 2 was unable to measure IRD from one set of images because the image quality was poor.
IRD=inter-rectus distance; 5ASU=5 cm above the superior border of the umbilicus; 3ASU=3 cm above the superior border of the umbilicus; SBU=superior border of the umbilicus; 3BIU=3 cm below the inferior border of the umbilicus.