Table 2.
Number of scanners per million inhabitants by country income group
| CT | MRI | SPECT | PET | |
|---|---|---|---|---|
| High-Income Countries | ||||
| Highest value | 42.3 | 34.3 | 20.5 | 4.3 |
| Upper Quartile (75th percentile) | 32.7 | 19.2 | 9.7 | 2.5 |
| Mean | 38.8 | 27.3 | 18.2 | 3.6 |
| Median | 20.5 | 12.6 | 5.4 | 1.2 |
| Lower Quartile (25th percentile) | 14.4 | 8.5 | 2.4 | 0.6 |
| Minimum value | 6.3 | 0 | 0 | 0 |
| Interquartile range (IQR) | 24.4 | 18.8 | 15.8 | 3 |
| Standard deviation (SD) | 16 | 10.4 | 7.5 | 3.4 |
| Upper-Middle-Income Countries | ||||
| Highest value | 29.8 | 16 | 5.2 | 0.7 |
| Upper Quartile (75th percentile) | 16.2 | 7.2 | 2.5 | 0.4 |
| Mean | 12.1 | 5.4 | 1.6 | 0.3 |
| Median | 7.8 | 3.4 | 0.9 | 0.2 |
| Lower Quartile (25th percentile) | 4.8 | 1.3 | 0 | 0 |
| Minimum value | 0 | 0 | 0 | 0 |
| Interquartile range (IQR) | 11.4 | 5.9 | 2.5 | 0.4 |
| Standard deviation (SD) | 10.1 | 4.8 | 1.8 | 0.5 |
| Lower-Middle-Income Countries | ||||
| Highest value | 7.8 | 3.3 | 0.9 | 0.2 |
| Upper Quartile (75th percentile) | 3.9 | 1.4 | 0.4 | 0.1 |
| Mean | 4.3 | 1.1 | 0.3 | 0.2 |
| Median | 1.4 | 0.4 | 0.1 | 0 |
| Lower Quartile (25th percentile) | 0.9 | 0.1 | 0 | 0 |
| Minimum value | 0 | 0 | 0 | 0 |
| Interquartile range (IQR) | 3 | 1.3 | 0.4 | 0.1 |
| Standard deviation (SD) | 3.2 | 1.2 | 0.3 | 0.3 |
| Low-Income Countries | ||||
| Highest value | 1.1 | 0.3 | 0.05 | 0 |
| Upper Quartile (75th percentile) | 0.9 | 0.2 | 0.03 | 0 |
| Mean | 0.69 | 0.2 | 0.04 | 0 |
| Median | 0.4 | 0.07 | 0 | 0 |
| Lower Quartile (25th percentile) | 0.2 | 0 | 0 | 0 |
| Minimum value | 0 | 0 | 0 | 0 |
| Interquartile range (IQR) | 0.7 | 0.2 | 0.03 | 0 |
| Standard deviation (SD) | 0.8 | 0.5 | 0.1 | 0 |
Data source: IMAGINE Database49