TABLE 1.
Summary of patient characteristics*
| Parameter | Clipping | Coiling | Z Value |
|---|---|---|---|
| No. of patients | 2585 | 6120 | |
| Mean age in yrs (SD) | 70.5 (4.0) | 72.7 (5.5) | –2.3 |
| Male sex | 625 (24.2%) | 1630 (26.6%) | –18.6 |
| African American race | 169 (6.5%) | 431 (7%) | –0.8 |
| Income in 2012 US$ (SD)† | $46,900 ($17,000) | $46,000 ($17,100) | –2.3 |
| Poverty† | 233 (9%) | 483 (7.9%) | –3.7 |
| Comorbidities‡ | |||
| Hypertension | 1354 (52.4%) | 2356 (38.5%) | –0.5 |
| Hyperlipidemia | 531 (20.5%) | 1339 (21.9%) | –2.3 |
| COPD | 76 (2.9%) | 156 (2.5%) | 1.1 |
| Myocardial infarction | 328 (12.7%) | 983 (16.1%) | –3.9 |
| Cardiac arrhythmia | 139 (5.4%) | 535 (8.7%) | –5.3 |
| Coagulopathy | 19 (0.7%) | 65 (1.1%) | –1.4 |
| Renal insufficiency | 66 (2.6%) | 258 (4.2%) | –3.7 |
| Congestive heart failure | 67 (2.6%) | 309 (5.0%) | –5.1 |
| Pulmonary disease§ | 75 (2.9%) | 147 (2.4%) | 1.4 |
| Obesity | 19 (0.7%) | 46 (0.8%) | –0.01 |
| Alcohol abuse | ¶ | 14 (0.2%) | 1.3 |
| Dementia | 17 (0.6%) | 82 (1.3%) | –2.7 |
| Ischemic stroke | 263 (10.2%) | 754 (12.3%) | –2.8 |
| Diabetes | 332 (12.8%) | 918 (15.0%) | –2.5 |
| Peripheral vascular disease | 265 (10.2%) | 923 (15.1%) | –5.9 |
| Malignancy | 162 (6.3%) | 484 (7.9%) | –2.6 |
COPD = chronic obstructive pulmonary disease; SD = standard deviation.
*
Values represent crude numbers.
†
The enrollee’s ZIP code was used to match to 2010 census data on income and poverty.
‡
Based on 12-month look back before the date of the procedure.
§
Non-COPD.
¶
Output suppressed to comply with the reporting rules of Medicare, which do not allow printing of output involving less than 11 patients.