Table 1.

Baseline characteristics of unmatched and propensity score–matched patients in aspirin user and nonuser groups

UnmatchedPropensity score matched
Aspirin usen = 2,083 (%)Nonusen = 48,026 (%)PAspirin usen = 2,082 (%)Nonusen = 2,082 (%)P
Age, years
 <50168 (8.07)10,205 (21.25)<0.001168 (8.07)144 (6.92)0.184
 50–60179 (8.59)9,607 (20.00)179 (8.60)190 (9.13)
 60–70557 (26.74)13,853 (28.84)556 (26.71)586 (28.15)
 70–80852 (40.90)11,018 (22.94)852 (40.92)877 (42.12)
 ≥80327 (15.70)3,343 (6.96)327 (15.71)285 (13.69)
Sex, male1,380 (66.25)27,075 (56.38)<0.0011,380 (66.28)1,374 (65.99)0.844
Comorbidities
 Ischemic heart disease1,478 (70.96)4,374 (9.11)<0.0011,477 (70.94)1,493 (71.71)0.584
 Chronic heart failure1,514 (72.68)5,803 (12.08)<0.0011,513 (72.67)1,518 (72.91)0.862
 Peripheral vascular disease501 (24.05)1,921 (4.00)<0.001500 (24.02)461 (22.14)0.151
 Cerebrovascular disease681 (32.69)2,020 (4.21)<0.001681 (32.71)668 (32.08)0.667
 Dementia126 (6.05)754 (1.57)<0.001126 (6.05)120 (5.76)0.693
 COPD134 (6.43)1,017 (2.12)<0.001134 (6.44)132 (6.34)0.899
 Collagen diseases248 (11.91)2,636 (5.49)<0.001248 (11.91)261 (12.54)0.539
 Peptic ulcers1,109 (53.24)13,628 (28.38)<0.0011,108 (53.22)1,147 (55.09)0.225
 Diabetes1,616 (77.58)12,998 (27.06)<0.0011,615 (77.57)1,657 (79.59)0.113
 Chronic kidney disease314 (15.07)1,123 (2.34)<0.001313 (15.03)293 (14.07)0.379
 Hemiplegia or paraplegia137 (6.58)1,090 (2.27)<0.001137 (6.58)115 (5.52)0.153
 Leukemia44 (2.11)363 (0.76)<0.00144 (2.11)49 (2.35)0.600
 Malignant lymphoma91 (4.37)1,331 (2.77)<0.00191 (4.37)90 (4.32)0.939
 Liver cirrhosis72 (3.46)2,279 (4.75)0.00772 (3.46)73 (3.51)0.933
 AIDS4 (0.19)78 (0.16)0.7434 (0.19)1 (0.05)0.180
H. pylori infection status
 Negative55 (2.64)1,671 (3.48)<0.00155 (2.64)69 (3.31)0.408
 Positive405 (19.44)6,030 (12.56)405 (19.45)392 (18.83)
 Unknown1,623 (77.92)40,325 (83.96)1,622 (77.91)1,621 (77.86)
  • NOTE: Bold indicates statistical significance (P < 0.05).

  • Abbreviations: AIDS, acquired immunodeficiency syndrome; COPD, chronic obstructive pulmonary disease.