Table 2.
Demographics and medical history of patients sampled by epoch and head CT performance.
| Overall | Epoch | CT at Index Visit | ||||||
|---|---|---|---|---|---|---|---|---|
|
|
|
|||||||
| 1 | 2 | 3 | P value1 | Yes | No | P value1 | ||
| Total N(%) | 582 (100.0) | 174 (29.9) | 215 (36.9) | 193 (33.2) | *** | 186 (32.0) | 396 (68.0) | *** |
| Sex N(%) | ||||||||
| Female | 367 (63.1) | 113 (30.8) | 1269 (35.2) | 125 (34.1) | 0.504 | 124 (33.8) | 243 (66.2) | 0.216 |
| Male | 215 (36.9) | 61 (28.4) | 86 (40.0) | 68 (31.6) | 62 (28.8) | 153 (71.2) | ||
| Age median (IQR) | 34 (23–49) | 35 (25–47) | 34 (21–53) | 34 (46) | 0.478 | 43 (29–56) | 31 (21–43) | <0.001 |
| Migraine history N(%) | 204 (35.1) | 71 (34.8) | 69 (33.8) | 64 (31.4) | 0.161 | 57 (27.9) | 147 (72.1) | 0.127 |
| History of significant cranial pathology N(%) | 103 (17.7) | 31 (30.1) | 43 (41.8) | 29 (28.2) | 0.421 | 43 (41.8) | 60 (58.3) | 0.019 |
1
Differences in categorical values determined by chi-square analysis; numerical values by Kruskal-Wallis test.