Table 1.
Radiological characteristics of patients with spontaneous subarachnoid haemorrhage who underwent surgical treatment, grouped by age.
| Characteristics | Age < 55 years (N = 127) |
Age ≥ 55 years (N = 105) |
Total (N = 232) |
p |
|---|---|---|---|---|
| Skull HU value, median (IQR), HU | 843.3 (685.0–1022.3) |
707.8 (568.1–828.5) |
773.0 (625.7–944.6) |
<0.001 |
| Classification of the skull HU value, based on tertile groups, HU | <0.001 | |||
| Tertile 1 | ≤737.3 | ≤624.8 | ≤684.0 | |
| Tertile 2 | 737.4–966.3 | 624.9–772.0 | 684.1–868.8 | |
| Tertile 3 | >966.3 | >772.0 | >868.8 | |
| Evans ratio on admission, mean ± SD | 0.253 ± 0.041 | 0.272 ± 0.036 | 0.262 ± 0.040 | <0.001 |
| BCI on admission, mean ± SD | 0.127 ± 0.037 | 0.162 ± 0.040 | 0.143 ± 0.042 | <0.001 |
| Ventriculomegaly on admission, n (%) | ||||
| BCI > 0.2 | 5 (3.9) | 17 (16.2) | 22 (9.5) | 0.001 |
| Evans ratio > 0.3 | 13 (10.2) | 21 (20.0) | 34 (14.7) | 0.028 |
| BCI > 0.2 and Evans ratio > 0.3 | 4 (3.1) | 10 (9.5) | 14 (6.0) | 0.040 |
| Follow-up Evans ratio, mean ± SD | 0.281 ± 0.061 | 0.299 ± 0.058 | 0.289 ± 0.060 | 0.022 |
| Follow-up BCI, mean ± SD | 0.166 ± 0.062 | 0.187 ± 0.059 | 0.176 ± 0.062 | 0.008 |
| Follow-up ventriculomegaly, n (%) | ||||
| BCI > 0.2 | 41 (32.3) | 47 (44.8) | 88 (37.9) | 0.035 |
| Evans ratio > 0.3 | 33 (26.0) | 43 (41.0) | 75 (32.3) | 0.017 |
| BCI > 0.2 and Evans ratio > 0.3 | 32 (25.2) | 39 (37.1) | 71 (30.6) | 0.034 |
| Time duration between SAH and follow-up image, mean ± SD, days | 109.5 ± 111.4 | 82.4 ± 95.2 | 97.2 ± 105.0 | 0.050 |
BCI, Bicaudate index; SAH, subarachnoid haemorrhage; SD, standard deviation.