Table 1

Patient characteristics by antiplatelet category

Aspirin
(n=128)
P2Y12
(n=63)
Aspirin+P2Y12
(n=136)
Age, mean (SD), years75 (13)76 (13)76 (13)
Female, no. (%)57 (45%)27 (43%)57 (42%)
Ethnicity, no. (%)
 Caucasian111 (87%)54 (86%)119 (88%)
 African-American10 (8%)6 (10%)7 (5%)
 Hispanic/Latino6 (5%)3 (5%)7 (5%)
 Other1 (1%)0 (0%)3 (2%)
Mechanism of injury, no. (%)
 Fall100 (78%)56 (89%)110 (81%)
 Motor vehicle crash14 (11%)1 (2%)*19 (14%)*
 Bicycle accident2 (2%)2 (3%)1 (1%)
 Motorcycle accident3 (2%)0 (0%)1 (1%)
 Pedestrian struck by vehicle5 (4%)1 (2%)2 (1%)
 Blunt injury to head (not fall)3 (2%)3 (5%)2 (1%)
 Other1 (1%)0 (0%)1 (1%)
Signs of head trauma, no. (%)113 (88%)*52 (83%)99 (73%)*
Symptoms, no. (%)
 Loss of consciousness55 (43%)*22 (35%)31 (23%)*
 Headache63 (49%)32 (51%)52 (38%)
 Seizure1 (1%)1 (2%)2 (1%)
 Nausea5 (4%)5 (8%)10 (7%)
 Vomiting3 (2%)3 (5%)5 (4%)
 Dizziness5 (4%)5 (8%)11 (8%)
Initial GCS group, no. (%)
 Mild (13–15)119 (93%)61 (97%)129 (95%)
 Moderate (9–12)5 (4%)2 (3%)4 (3%)
 Severe (3–8)4 (3%)0 (0%)3 (2%)
Injury severity score, mean (SD)10 (9)9 (10)12 (13)
Initial vital signs, mean (SD)
 Systolic blood pressure, mmHg147 (30)148 (24)145 (27)
 Diastolic blood pressure, mmHg76 (18)76 (18)74 (18)
 Heart rate, beats/min85 (17)*81 (15)79 (18)*
 Respiratory rate, breaths/min19 (4)*18 (3)18 (2)*
 Oxygen saturation, %97 (3)96 (5)96 (8)
Platelet count, mean (SD), ×109/L218 (63)209 (64)208 (72)
INR, mean (SD)1.04 (0.10)1.05 (0.12)1.06 (0.11)
  • *Indicates statistically significant difference between items within the row at p<0.05 by z-test for proportions and t-test for means.

  • GCS, Glasgow Coma Scale; INR, international normalized ratio.