Table 1.
Comparison of Bland-Altman statistics by percentage difference and standard methods for different R2-MRI and R2*-MRI methods
| Comparison method / MRI method | Bias | SD | 95% confidence interval |
|---|---|---|---|
| Percentage difference method | |||
| R2*-MRI (using robust regression analysis), % | 3 | 21 | −39 to 45 |
| R2*-MRI (Wood et al3; using least squares regression analysis), % | 1 | 23 | −46 to 44 |
| R2-MRI (St Pierre et al2; using nonlinear regression algorithms), % | −3 | 27 | −56 to 50 |
| Standard method | |||
| R2*-MRI (Altman and Bland6,7; using robust regression analysis), mg Fe/g | 0.0757 | 1.84 | −3.60 to 3.76 |
The Bland-Altman percentage difference method8 was calculated using the formula (HIC [R2*] − HIC [biopsy])/([HIC (R2*) + HIC (biopsy)]/2).