Table 4.
Subgroup analyses of total radiomics quality score assessed by the three independent readers
| Reader 1 | Reader 2 | Reader 3 | |||||
|---|---|---|---|---|---|---|---|
| Group | N | RQS total | p value | RQS total | p value | RQS total | p value |
| Journal type | 0.542 | 0.302 | 0.562 | ||||
| Imaging | 18 | 6.5 (0–14) | 8.5 (4.5–13) | 8 (1–14) | |||
| Clinical | 15 | 12 (8–13) | 8 (4–13) | 11 (5–13) | |||
| Computer science | 5 | 9 (1–9) | 2 (−1 to 9.5) | 11 (−2 to 11.5) | |||
| Publication year | 0.772 | 0.322 | 0.352 | ||||
| 2021 | 21 | 9 (2–13) | 9 (4.5–12.5) | 12 (5.5–14) | |||
| 2013–2020 | 17 | 8 (0.5–14.5) | 7 (0.5–12.5) | 7 (3–13.5) | |||
| Journal quartile | 0.787 | 0.510 | 0.814 | ||||
| Q1 | 17 | 8 (0.5–14.5) | 7 (2.5–13) | 9 (3.5–14) | |||
| Q2 | 14 | 11.5 (0.5–13) | 10 (4.5–14) | 8 (0.7–13.2) | |||
| Q3 | 7 | 9 (2–9) | 6 (2–10) | 11 (6–14) | |||
| Impact factor | 0.048 | 0.035 | 0.224 | ||||
| ≤ 4 | 15 | 4 (−2 to 10) | 6 (−1 to 9) | 7 (−1 to 14) | |||
| > 4 | 23 | 11 (3–15) | 11 (5–13) | 11 (6–14) | |||
| Cholangiocarcinoma | 0.074 | 0.124 | 0.152 | ||||
| Intrahepatic | 29 | 8 (−0.5 to 12.5) | 6 (2–12) | 9 (2–13.5) | |||
| Perihilar/extrahepatic | 9 | 12 (8–15) | 11 (7–13.5) | 13 (7.5–14.5) | |||
| Imaging modality | 0.361 | 0.206 | 0.067 | ||||
| CT | 20 | 11 (0.2–13.7) | 10.5 (3.5–13.7) | 13 (1.5–14) | |||
| MRI/MRI and CT | 18 | 8 (1.7–10.5) | 7 (1.2–11.2) | 6.5 (4.7–11.2) | |||
| Number of patients | < 0.001 | < 0.001 | < 0.001 | ||||
| ≤ 100 | 12 | 0.5 (−2 to 6.7) | 2.5 (−1.7 to 5) | 0.5 (−2.7 to 8.2) | |||
| > 100 | 26 | 11.5 (8.7–15) | 11 (7.5–13.2) | 12.5 (7–14) | |||
Continuous variables are expressed as medians and interquartile range (25th to 75th percentile) in parenthesis. Continuous variables were compared using the Kruskal–Wallis or the Mann–Whitney U test. Statistically significant values (p < 0.05) are highlighted in bold
CT, Computed Tomography; MRI, Magnetic Resonance Imaging