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Table 2 Bleeding and transfusion-related data of the patients according to preoperative use of low-dose acetylsalicylic acid (LdAA)

From: Bleeding and first-year mortality following hip fracture surgery and preoperative use of low-dose acetylsalicylic acid: an observational cohort study

  LdAA No LdAA Mean difference or odds ratio (95% CI) * P value
  (n = 118) (n = 137)   
Hemoglobin (g/L) at baseline 126 (15.8) 124 (14.2)   0.16
Platelet count (×109/L) 264 (125) 263 (90)   0.97
APTT 33.1 (5.9) 31.6 (4.1)   0.02
INR 1.07 (0.12) 1.04 (0.09)   0.01
Patients transfused pre- or intraoperatively 47 (39.8) 49 (35.8) 1.5 (0.78, 2.8) 0.23
Units transfused pre- or intraoperatively 0.7 (0.9) 0.7 (1.0) 0.1 (-0.1, 0.3) 0.27
Bleeding intraoperatively (mL) 363 (235) 316 (329) 45 (-27, 117) 0.22
Patients transfused postoperatively 74 (62.7) 76 (54) 1.8 (1.04, 3.3) 0.04
Units transfused postoperatively 1.3 (1.3) 1.1 (1.2) 0.3 (-0.01, 0.62) 0.06
Hemoglobin day 1 (g/L) 109 (11.1) 108 (10.4) 0.3 (-2.4, 3.0) 0.89
Hemoglobin day 5 (g/L) 111 (10.7) 113 (9.5) -1.9 (-4.5, 0.77) 0.11
  1. Values are shown as mean (SD) except patients transfused shown as n (%)
  2. *Logistic regression or ANCOVA adjusting for age, sex, baseline hemoglobin and type of surgery.
  3. No data were available for 7 patients using and 5 patients not using acetylsalicylic acid
  4. APTT: activated partial thromboplastin time; INR: international normalized ratio