Table 3.
Intraobserver and short-term interstudy variability using cardiac MR in normal healthy adults
| Parameter | Variability | Mean difference | p-value | Limits of agreement | Intraclass correlation coefficient (95% confidence interval) | Smallest detectable change |
|---|---|---|---|---|---|---|
| LV ejection fraction (%) | Intraobserver | 1.00 ± 1.27 | 0.11 | −1.48 to 3.48 | 0.99 (0.94–1.00) | – |
| Interstudy | 0.57 ± 2.94 | 0.63 | −5.19 to 6.33 | 0.93 (0.62–1.00) | 5.8 | |
| LV end-diastolic volume (ml) | Intraobserver | 0.67 ± 3.62 | 0.67 | −6.43 to 7.77 | 0.99 (0.95–1.00) | – |
| Interstudy | −1.57 ± 6.47 | 0.43 | −14.25 to 11.11 | 0.99 (0.97–1.00) | 12.7 | |
| LV end-systolic volume (ml) | Intraobserver | −0.83 ± 2.79 | 0.50 | −6.30 to 4.64 | 0.99 (0.93–1.00) | – |
| Interstudy | −1.29 ± 3.65 | 0.37 | −8.44 to 5.86 | 0.98 (0.91–1.00) | 7.2 | |
| LV mass (g) | Intraobserver | −0.33 ± 2.16 | 0.21 | −4.56 to 3.90 | 0.99 (0.95–1.00) | – |
| Interstudy | −1.00 ± 3.03 | 0.50 | −6.94 to 4.94 | 0.98 (0.91–1.00) | 5.9 |
LV, left ventricular.
Data are mean ± standard deviation. Changes in LV parameters were compared using a paired Student's t-test.