Table 2.
Interrater Reliability of Inter-Rectus Distance Measurement
| Anatomical measurement site and condition |
Sample size |
Measurement (cm) |
||
|---|---|---|---|---|
| ICC(3,k) (95% CI) | SEM | MDC | ||
| 5ASU | ||||
| At rest | 17 | 0.91 (0.086, 0.98) | 0.38 | 1.06 |
| Head lift | 17 | 0.96 (0.83, 0.99) | 0.23 | 0.64 |
| 3ASU | ||||
| At rest | 17 | 0.82 (0.61, 0.96) | 0.37 | 1.03 |
| Head lift | 17 | 0.87 (0.65, 0.95) | 0.38 | 1.04 |
| SBU | ||||
| At rest | 17 | 0.72 (0.24, 0.90) | 0.71 | 1.97 |
| Head lift | 17 | 0.63 (0.017, 0.87) | 0.68 | 1.89 |
| 3BIU | ||||
| At rest | 16 | 0.85 (0.58, 0.95) | 0.46 | 1.29 |
| Head lift | 16 | 0.74 (0.23, 0.91) | 0.50 | 1.38 |
Note: The sample size was reduced to n=16 for measurements made below the umbilicus; Rater 2 was unable to measure inter-rectus distance from one set of images because the image quality was poor.
ICC=intra-class correlation coefficient; 95% CI=95% CI around the ICC; SEM=standard error of measurement; MDC=minimal detectable change; 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.