Table 2.
Unadjusted association of outcomes with subarachnoid hemorrhage patient volume.
| Quintile 1 (95% CI) |
Quintile 2 (95% CI) |
Quintile 3 (95% CI) |
Quintile 4 (95% CI) |
Quintile 5 (95% CI) |
|
|---|---|---|---|---|---|
| SAH Patient Volume | 1–1 | 2–2 | 3–4 | 5–13 | 14–230 |
|
| |||||
|
All Cases
| |||||
| Inpatient Mortality | 52.0% (48.8%–55.0%) | 43.3% (40.0%–46.6%) | 41.0% (38.5%–43.4%) | 32.4% (31.1%–33.6%) | 22.5% (21.9%–23.0%) |
| Good Outcome | 16.2% (14.0%–18.6%) | 20.9% (18.3%–23.7%) | 24.4% (22.3%–26.6%) | 31.0% (29.7%–32.2%) | 39.5% (38.8%–40.1%) |
| Bad Outcome | 57.4% (54.3%–60.4%) | 48.8% (45.4%–52.1%) | 45.6% (43.1%–48.0%) | 36.7% (35.3%–38.0%) | 26.0% (25.3%–26.5%) |
|
| |||||
|
Intubated
| |||||
| Inpatient Mortality | 84.7% (80.2%–88.0%) | 80.2% (75.2%–84.3%) | 76.9% (73.2%–80.1%) | 65.3% (63.1%–67.0%) | 47.4% (46.3%–48.4%) |
| Good Outcome | 3.1% (1.6%–5.6%) | 2.3% (1.1%–4.7%) | 4.2% (2.8%–6.1%) | 5.2% (4.2%–6.0%) | 11.4% (10.7%–12.0%) |
| Bad Outcome | 88.8% (84.7%–91.9%) | 85.8% (81.3%–89.3%) | 80.8% (77.4%–83.8%) | 70.3% (68.2%–72.2%) | 52.9% (51.8%–53.9%) |
|
| |||||
|
Clip Coil
| |||||
| Inpatient Mortality | 16.9% (5.5%–41.3%) | 27.5% (15.9%–43.2%) | 27.8% (21.6%–34.8%) | 18.1% (16.0%–20.2%) | 13.3% (12.7%–13.9%) |
| Good Outcome | 32.7% (15.3%–56.4%) | 26.0% (14.5%–41.9%) | 30.5% (24.1%–37.5%) | 32.4% (29.9%–34.9%) | 39.6% (38.7%–40.4%) |
| Bad Outcome | 34.0% (16.1%–57.8%) | 32.3% (19.7%–48.1%) | 30.3% (23.9%–37.4%) | 22.9% (20.6%–25.1%) | 17.2% (16.4%–17.8%) |
|
| |||||
|
Excluding No Aggressive Care
| |||||
| Inpatient Mortality | 82.8% (78.2%–86.5%) | 75.4% (70.3%–79.8%) | 67.9% (64.2%–71.2%) | 48.4% (46.5%–50.2%) | 28.0% (27.3%–28.6%) |
| Good Outcome | 4.5% (2.7%–7.3%) | 5.1% (3.1%–8.1%) | 10.2% (8.1%–12.7%) | 17.3% (15.9%–18.7%) | 31.0% (30.3%–31.7%) |
| Bad Outcome | 87.1% (82.9%–90.3%) | 80.8% (76.0%–84.7%) | 71.2% (67.7%–74.4%) | 52.7% (50.8%–54.5%) | 31.9% (31.1%–32.6%) |
|
| |||||
|
Excluding No Aggressive Care in Early Deaths
| |||||
| Inpatient Mortality | 43.1% (39.8%–46.4%) | 38.2% (34.8%–41.6%) | 37.1% (34.6%–39.5%) | 30.1% (28.8%–31.3%) | 21.1% (20.5%–21.0%) |
| Good Outcome | 19.9% (17.3%–22.8%) | 23.3% (20.4%–26.3%) | 26.5% (24.2%–28.0%) | 32.3% (31.0%–33.5%) | 40.3% (39.7%–40.9%) |
| Bad Outcome | 47.6% (44.2%–50.9%) | 43.0% (39.5%–46.5%) | 41.0% (38.5%–43.5%) | 34.1% (32.7%–35.3%) | 24.4% (23.8%–24.9%) |
CI = confidence interval