Prediction Model A – Recursive Partitioning Model | |||||||||||||
Prediction Model Pathways | Diagnostic codes (ICD10CA) | Procedural codes (CCI) | Admission characteristics | Predicted probability of pSAH (%) | |||||||||
SAH (ICD 160) | ICH (ICD 161) | Other nontraumatic ICH (ICD 162) | Other CVD (ICD 167) | Intracranial Injury (ICD S06) | Therapeutic Carotid Artery Occlusion (CCI 1JE51) | Therapeutic Occlusion Intracranial Vessels (CCI 1JW51) | Extracranial Vessel Imaging (CCI 3JW10) | LOS (days) | Admission Type | ||||
1 | + | 97.6 | |||||||||||
2 | + | + | 100 | ||||||||||
3 | + | – | ≥2 | 83.7 | |||||||||
4 | + | – | < 2 | 100 | |||||||||
5 | – | + | 76.9 | ||||||||||
6 | – | + | – | 41.2 | |||||||||
7 | – | + | – | Urgent | 28.6 | ||||||||
8 | – | + | – | Nonurgent | 100 | ||||||||
9 | – | – | + | – | 100 | ||||||||
10 | – | – | + | – | – | 26.7 | |||||||
11 | – | – | + | – | – | + | 100 | ||||||
12 | – | – | + | – | – | – | 15.4 | ||||||
13 | – | – | + | – | – | 28.6 | |||||||
14 | – | – | – | – | + | – | 10.3 | ||||||
15 | – | – | – | – | + | – | Urgent | 2.9 | |||||
16 | – | – | – | – | + | – | Nonurgent | 75 | |||||
17 | – | – | – | – | – | – | 0.1 | ||||||
Prediction Model B – SAH prediction point system | |||||||||||||
Prediction Variables | Diagnostic codes (ICD10CA) | Procedural codes (CCI) | Admission characteristics | ||||||||||
SAH (ICD 160) | ICH (ICD 161) | Other CVD (ICD 167) | Intracranial Injury (ICD S06) | Other postprocedural nervous system disorder (ICD G97) | Therapeutic Occlusion Intracranial Vessels (CCI 1JW51) | Extracranial Vessel Imaging (CCI 3JW10) | CT scan (soft tissue of neck) (3FY20) | CT scan (abdominal cavity) (3OT20) | LOS | Admission Type (Urgent or Emergent) | Admitted to ICU | ||
≤ 2 days | ≥ 3 days | ||||||||||||
Points | 6 | 4 | 4 | 3 | 4 | 3 | 1 | −3 | −2 | 0 | −1 | 2 | 1 |
Score | Predicted probability of pSAH (%) | ||||||||||||
≤ 0 | 0 | ||||||||||||
1 | 0.1 | ||||||||||||
2 | 0.1 | ||||||||||||
3 | 1.4 | ||||||||||||
4 | 2.4 | ||||||||||||
5 | 17.2 | ||||||||||||
6 | 33.3 | ||||||||||||
7 | 63.9 | ||||||||||||
8 | 94.6 | ||||||||||||
9 | 97.0 | ||||||||||||
10 | 100 | ||||||||||||
11 | 100 | ||||||||||||
12 | 98.8 | ||||||||||||
≥ 13 | 100 | ||||||||||||
Prediction Model C – Prevalence-adjusted SAH Prediction Point System | |||||||||||||
Prediction Variables | Diagnostic codes (ICD10CA) | Procedural codes (CCI) | |||||||||||
SAH (ICD 160) | ICH (ICD 161) | Therapeutic Occlusion Intracranial Vessels (CCI 1JW51) | |||||||||||
Points | 2 | 1 | 1 | ||||||||||
Score | 50%tile Predicted probability of pSAH (%) (2.5–97.5%ile) | ||||||||||||
0 | 0 (0–0.01) | ||||||||||||
1 | 2.5 (0–5.6) | ||||||||||||
2 | 20 (5–35.3) | ||||||||||||
3 | 100 (100–100) | ||||||||||||
4 | 100 (100–100) |