Table 2. Intraclass Correlations and Coefficients of Repeatability and Reproducibility.
| PMIs (time-points) | ICCa (M1–M2) | ICCa (M1–M3) | ICCa (M2–M3) | CoR % (M1–M2) | CVW% | CoR % (M1–M3) | CVW% | CoR % (M2–M3) | CVW% |
|---|---|---|---|---|---|---|---|---|---|
| Immediately | 0.991 (0.974–0.997) | 0.991 (0.975–0.997) | 0.997 (0.993–0.999) | 1.1 (0.8–1.3) | 0.5 (0.4–0.7) | 1.1 (0.8–1.3) | 0.5 (0.4–0.7) | 0.6 (0.4–0.8) | 0.3 (0.2–0.4) |
| 30th minute | 0.991 (0.973–0.997) | 0.96 (0.888–0.986) | 0.972 (0.921–0.99) | 0.3 (0.2–0.5) | 0.2 (0.1–0.3) | 0.8 (0.6–1.1) | 0.4 (0.3–0.5) | 0.6 (0.3–0.9) | 0.3 (0.2–0.4) |
| 1st hour | 0.935 (0.826–0.977) | 0.962 (0.896–0.987) | 0.979 (0.942–0.993) | 1.5 (1.0–2.1) | 0.8 (0.5–1.0) | 1.1 (0.6–1.6) | 0.5 (0.3–0.8) | 0.7 (0.2–1.0) | 0.4 (0.1–0.6) |
| 6th hour | 0.997 (0.993–0.999) | 0.997 (0.992–0.999) | 1.0 (0.999–1.0) | 0.7 (0.4–1) | 0.4 (0.2–0.5) | 0.7 (0.4–1.0) | 0.4 (0.2–0.5) | 0.2 (0.1–0.3) | 0.1 (0.0–0.2) |
| 12th hour | 0.996 (0.987–0.998) | 0.990 (0.972–0.997) | 0.997 (0.99–0.999) | 0.6 (0.3–0.9) | 0.3 (0.1–0.4) | 0.8 (0.3–1.3) | 0.4 (0.1–0.6) | 0.4 (0.1–0.7) | 0.2 (0.1–0.4) |
| 24th hour | 0.997 (0.99–0.999) | 0.995 (0.987–0.998) | 0.999 (0.996–1.0) | 0.5 (0.2–0.9) | 0.2 (0.1–0.4) | 0.6 (0.2–0.9) | 0.3 (0.1–0.4) | 0.3 (0.1–0.5) | 0.1 (0.1–0.2) |
| 48th hour | 0.986 (0.961–0.995) | 0.994 (0.982–0.998) | 0.997 (0.991–0.999) | 0.8 (0.3–1.3) | 0.4 (0.1–0.6) | 0.8 (0.5–1.0) | 0.3 (0.2–0.5) | 0.5 (0.2–0.7) | 0.2 (0.1–0.4) |
| Later* | 0.819 (0.556–0.933) | 0.808 (0.534–0.928) | 0.949 (0.860–0.982) | 3.5 (1.7–5.4) | 1.7 (0.8–2.7) | 3.7 (1.6–5.7) | 1.8 (0.8–2.8) | 2.2 (1–3.5) | 1.1 (0.5–1.7) |
aType C intraclass correlation coefficients using a consistency definition: the between- measure variance is excluded from the denominator variance. The estimator is the same, whether the interaction effect is present or not.
*Within a range of 48–96 hours.
Data in parentheses represent 95% CI.
M1 represents measurements by observer 1;
M2 represents repeat measurements by observer 1 at the same session (time-point);
M3 represents repeat measurements by observer 2 at the same session (time-point).
CoR (M1, M2) coefficient of repeatability;
CoR (M1, M3), CoR (M2, M3), coefficients of reproducibility;
CVw, coefficient of variation.
CoR and CVw are expressed as percentages (Coefficients % = Coefficients *100).