Baseline characteristics and hospitalisation complications of all anSAH patients
| Variables | Overall | PAN-SAH | NPAN-SAH | P value |
| (n=303) | (n=110) | (n=193) | ||
| Age mean (years) | 54.7±11.2 | 52.7±11.5 | 55.7±11.1 | 0.027†* |
| >60 years, no (%) | 104 (34.3) | 24 (21.8) | 80 (41.5) | 0.001‡* |
| Female, no (%) | 159 (52.5) | 59 (53.6) | 100 (51.8) | 0.760‡ |
| Smoking history, no (%) | 64 (21.1) | 23 (20.9) | 41 (21.2) | 0.993‡ |
| Medical history, no (%) | ||||
| Hypertension | 118 (38.9) | 35 (31.8) | 83 (43.0) | 0.055‡ |
| Hyperlipidaemia | 136 (44.9) | 53 (48.2) | 83 (43.0) | 0.384‡ |
| Diabetes mellitus | 50 (16.5) | 15 (13.6) | 35 (18.1) | 0.310‡ |
| Coronary heart disease | 22 (7.3) | 7 (6.4) | 15 (7.8) | 0.650‡ |
| Ischaemic cerebrovascular disease | 18 (5.9) | 5 (4.5) | 13 (6.7) | 0.410‡ |
| Antithrombotic drugs, no (%) | 19 (6.3) | 8 (7.3) | 11 (5.7) | 0.587‡ |
| HH grades 3–5 | 20 (6.6) | 0 | 20 (10.4) | <0.001‡* |
| mFS 3–4 | 76 (25.1) | 17 (15.0) | 59 (30.6) | 0.004‡* |
| GCS 3–12 | 12 (4.0) | 2 (1.8) | 10 (5.2) | 0.255‡ |
| Complications | ||||
| Rebleed, no (%) | 2 (0.7) | 0 | 2 (1.0) | 0.536§ |
| Ictal infarction, no (%) | 2 (0.7) | 1 (0.9) | 1 (0.5) | 0.999§ |
| Delayed cerebral infarction, no (%) | 6 (2.0) | 2 (1.8) | 4 (2.1) | 0.999§ |
| Vasospasm, no (%) | 6 (2.0) | 1 (0.9) | 5 (2.6) | 0.423§ |
| Hydrocephalus, no (%) | 50 (16.5) | 5 (4.5) | 45 (23.3) | <0.001‡* |
| CSF drainage, no (%) | 5 (1.7) | 0 | 5 (2.6) | 0.163§ |
| Pulmonary infection, no (%) | 20 (6.6) | 1 (0.9) | 19 (9.8) | 0.001‡* |
| Electrolyte imbalance, no (%) | 171 (56.4) | 45 (40.9) | 126 (65.3) | <0.001‡* |
| Acute gastric ulcer, no (%) | 19 (6.3) | 2 (1.8) | 17 (8.8) | 0.016‡* |
| Deep venous thrombosis, no (%) | 14 (4.6) | 6 (5.5) | 8 (4.1) | 0.602‡ |
| Death, no (%) | 3 (1.0) | 0 | 3 (1.6) | 0.556§ |
| LOS mean (days) | 12.9±5.8 | 12.0±5.0 | 13.4±6.2 | 0.041†* |
*p<0.05.
†T-test.
‡χ2 test.
§Fisher’s exact test.
anSAH, angiogram-negative subarachnoid haemorrhage; CSF, cerebrospinal fluid; GCS, Glasgow Coma Score; HH grade, Hunt-Hess grade; LOS, length of stay; mFS, modified Fisher Scale; NPAN-SAH, non-perimesencephalic angiogram-negative SAH; PAN-SAH, perimesencephalic angiogram-negative SAH.