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Table 1 Characteristics of patients with and without long-term aspirin use before and after matching

From: Evaluating the safety of early surgery for ruptured intracranial aneurysms in patients with long-term aspirin use: a propensity score matching study

Characteristics Before matching    After matching   
  Aspirin group (n = 21) Non-aspirin group (n = 194) P value Aspirin group (n = 21) Non-aspirin group (n = 42) P value
Age (year) 58.9 ± 8.4 53.9 ± 10.4 0.037 58.9 ± 8.4 57.2 ± 10.3 0.737
Sex    0.666    0.422
 Male 7 (33.3) 74 (38.1)   7 (33.3) 10 (23.8)  
 Female 14 (66.7) 120 (61.9)   14 (66.7) 32 (76.2)  
Hunt-Hess grade    > 0.999    > 0.999
 1–3 20 (95.2) 186 (95.9)   20 (95.2) 40 (95.2)  
 4–5 1 (4.8) 8 (4.1)   1 (4.8) 2 (4.8)  
Modified Fisher grade    0.331    0.285
 1 3 (14.3) 13 (6.7)   3 (14.3) 2 (4.8)  
 2–3 5 (23.8) 68 (35.1)   5 (23.8) 16 (38.1)  
 4 13 (61.9) 113 (58.2)   13 (61.9) 24 (57.1)  
Aneurysm size (mm) 6.3 ± 2.6 6.2 ± 3.3 0.421 6.3 ± 2.6 6.5 ± 3.2 0.901
Site    > 0.999    > 0.999
 Anterior circulation 21 (100) 191 (98.5)   21 (100) 42 (100)  
 Posterior circulation 0 3 (1.5)   0 0  
Comorbidity history 20 (95.2) 113 (58.2) 0.001 20 (95.2) 42 (100) 0.333
Mean propensity score 0.173 0.090   0.165 0.163  
  1. Categorical variables are presented as number (%), and continuous variables are presented as mean ± standard deviation