Cumulative number of computed tomography of the head performed over the 3-year period by patient
| Numbers of CT of the head | Not under active neurology follow-up, total n=2,703 | Under active neurology follow-up, total n=1,480 | Total, grand total n=4,183 |
|---|---|---|---|
| 0, n (%) | 1,724 (63.78) | 809 (54.66) | 2,533 |
| 1, n (%) | 863 (31.93) | 501 (33.85) | 1,364 |
| 2, n (%) | 81 (3.00) | 108 (7.30) | 189 |
| 3, n (%) | 22 (0.81) | 35 (2.36) | 57 |
| 4 or more, n (%) | 13 (0.38) | 27 (1.82) | 40 |
| χ2=88.3; p<0.001 |
CT = computed tomography.