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| Group | Number of participants | Age (years) | Sex (male/female) |
|---|---|---|---|
| Group A | 20 | 59.5 (22 to 80) | 11/9 |
| Group B | 20 | 50 (28 to 76) | 8/12 |
| χ2/t | –0.690 | 2.000 | |
| P | 0.490 | 0.157 |
Age is expressed as the median (interquartile range). Group A underwent continuous perfusion scanning; group B underwent intermittent perfusion scanning.
