Table 2.
Details of diagnostic imaging tests investigated in this study
| Imaging schedule | ||||||
|---|---|---|---|---|---|---|
| 3–6-Monthly, most frequent (n = 115) |
12-Monthly, intermediate (n = 273) | No routine, least frequent (n = 165) | ||||
| N |
n per 10 patient-years (95% CI) |
N |
n per 10 patient-years (95% CI) |
N | n per 10 patient-years (95% CI) | |
| CT | 602 | 12 (10.9–12.8) | 1490 | 9.1 (8.7–9.6) | 173 | 2.4 (2.0–2.8) |
| PET | 84 | 1.6 (1.3–2.0) | 131 | 0.80 (0.67–0.95) | 30 | 0.41 (0.28–0.59) |
| PET and CT | 87 | 1.7 (1.4–2.1) | 212 | 1.3 (1.1–1.5) | 84 | 1.2 (0.9–1.4) |
| Ultrasound | 235 | 4.6 (4.0–5.2) | 1239 | 7.6 (7.2–8.0) | 74 | 1.0 (0.80–1.3) |
| X-ray | 264 | 5.2 (4.6–5.8) | 143 | 0.88 (0.74–1.0) | 27 | 0.37 (0.25–0.54) |
| MRI | 178 | 3.5 (3.0–4.0) | 90 | 0.55 (0.44–0.68) | 67 | 0.92 (0.72–1.2) |
| Total | 1450 | 28 (27.0–30.0) | 3305 | 20 (19.5–20.9) | 455 | 6.3 (5.7–6.9) |
CI, confidence interval; CT, computed tomography; PET, positron emission tomography; MRI, magnetic resonance imaging