Table 4. Predicted standard deviation (SD) of Limits-of-agreement (LAO) for emphysema index (EI) for the inter-software comparison grouped for patients with low and high intra-patient variability of the EI.
| Programs | Low intra-patient variability | High-intra-patient variability | ratio |
|---|---|---|---|
| 1–2 | 2.55 | 2.93 | 1.15 |
| 1–3 | 3.24 | 4.46 | 1.37 |
| 1–4 | 3.17 | 5.73 | 1.81 |
| 2–3 | 3.27 | 4.12 | 1.26 |
| 2–4 | 3.19 | 5.48 | 1.72 |
| 3–4 | 3.77 | 6.42 | 1.71 |
Median SD of the intra-patient variability of EI determined with program 2 served as a cut-off for group definition.