| Demographic summary | Univariate analysis | Multivariate analysis | |||||
---|---|---|---|---|---|---|---|---|
Stratum | Number of image pairs | Number of patients | Coefficient | 95% CI | p | Coefficient | 95% CI | p |
Overall | 2,225 | 253 | 0.86 | [0.85, 0.87] | < 0.001 | Â | Â | Â |
Age* (years) | 58.38 ± 12.37 (38.60–77) |  |  |  |  |  |  |  |
 < 45 (intercept) | 260 | 33 | 0.89 | [0.85, 0.92] | < 0.001 | / | / | / |
 45–64 | 1,211 | 142 | − 0.02 | [− 0.06, 0.02] | 0.34 | − 0.01 | [− 0.04, 0.02] | 0.56 |
 > 65 | 754 | 78 | − 0.05 | [− 0.09, − 0.01] | 0.02 | − 0.04 | [− 0.07, 0.00] | 0.06 |
Sex | Â | Â | Â | Â | Â | Â | Â | Â |
 M (intercept) | 1,062 | 108 | 0.87 | [0.86, 0.89] | < 0.001 | / | / | / |
 F | 1,163 | 145 | − 0.03 | [− 0.05, 0.00] | 0.02 | − 0.03 | [− 0.05, − 0.01] | 0.01 |
BMI* (kg/m2) | 20.06 ± 5.99 (20.65–39.53) |  |  |  |  |  |  |  |
 < 24.9 (intercept) | 571 | 62 | 0.83 | [0.81, 0.86] | < 0.001 |  |  |  |
 25–30 | 792 | 91 | + 0.03 | [− 0.00, 0.06] | 0.05 |  |  |  |
 > 30 | 842 | 94 | + 0.04 | [0.01, 0.07] | 0.01 |  |  |  |
Etiology | Â | Â | Â | Â | Â | Â | Â | Â |
 Hepatitis B (intercept) | 466 | 37 | 0.85 | [0.82, 0.89] | < 0.001 |  |  |  |
 Hepatitis C | 1,042 | 108 | + 0.01 | [− 0.02, 0.05] | 0.50 |  |  |  |
 Alcohol | 164 | 33 | − 0.01 | [− 0.06, 0.04] | 0.63 |  |  |  |
 Nonalcoholic fatty liver disease | 276 | 35 | + 0.02 | [− 0.02, 0.07] | 0.39 |  |  |  |
 Autoimmune hepatitis | 98 | 11 | + 0.03 | [− 0.03, 0.10] | 0.34 |  |  |  |
 Other | 179 | 29 | + 0.00 | [− 0.05, 0.05] | 0.93 |  |  |  |
Time between series* (days) | 324.72 ± 407.73 (0–1,255) |  |  |  |  |  |  |  |
 Same day (intercept) | 674 | 196 | 0.9 | [0.89, 0.92] | < 0.001 | / | / | / |
 0–1 year | 823 | 135 | − 0.05 | [− 0.06, − 0.04] | < 0.001 | − 0.03 | [− 0.04, − 0.02] | < 0.001 |
 1–2 years | 469 | 93 | − 0.08 | [− 0.09, − 0.07] | < 0.001 | − 0.05 | [− 0.07, − 0.03] | < 0.001 |
 > 2 years | 259 | 29 | − 0.10 | [− 0.12, − 0.08] | < 0.001 | − 0.08 | [− 0.10, − 0.06] | < 0.001 |
Artifacts | Â | Â | Â | Â | Â | Â | Â | Â |
 No artifacts (intercept) | 1,278 | 185 | 0.86 | [0.85, 0.88] | < 0.001 |  |  |  |
 One image | 597 | 105 | − 0.00 | [− 0.02, 0.01] | 0.68 |  |  |  |
 Both images | 350 | 65 | − 0.01 | [− 0.02, 0.01] | 0.55 |  |  |  |
HBP contrast uptake adequacy | Â | Â | Â | Â | Â | Â | Â | Â |
 Both adequate (intercept) | 1,435 | 193 | 0.87 | [0.86, 0.88] | < 0.001 | / | / | / |
 One adequate, one suboptimal | 350 | 54 | − 0.02 | [− 0.03, − 0.01] | 0.01 | − 0.02 | [− 0.03, 0.00] | 0.01 |
 Both suboptimal | 340 | 62 | + 0.02 | [− 0.01, 0.04] | 0.15 | + 0.00 | [− 0.02, 0.02] | 0.96 |
 Missing | 100 | 16 | / | / | / | / | / | / |
Voxel volume difference* (mm3) | 0.76 ± 1.52 (0–3.02) |  |  |  |  |  |  |  |
 0 (intercept) | 746 | 186 | 0.90 | [0.89, 0.92] | < 0.001 | / | / | / |
 0–1 | 1,064 | 141 | − 0.06 | [− 0.07, − 0.05] | < 0.001 | − 0.02 | [− 0.03, − 0.01] | < 0.001 |
 > 1 | 402 | 86 | − 0.09 | [− 0.10, − 0.07] | < 0.001 | − 0.05 | [− 0.06, − 0.03] | < 0.001 |
Slice thickness* (mm) | 4.53 ± 0.73 (3.00–6.00) |  |  |  |  |  |  |  |
Pixel spacing* (mm) | 0.82 ± 0.15 (0.70–0.94) |  |  |  |  |  |  |  |