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Table 1 Baseline Characteristics

From: Preoperative moderate thrombocytopenia is not associated with increased blood loss for low-risk cesarean section: a retrospective cohort study

 Thrombocytopenic Group (n = 155)Control Group (n = 310)Standardized differencep value
Age (yrs)31.5 ± 4.531.5 ± 4.30.010.905
BMI (kg/m2)26.2 ± 3.027.1 ± 2.80.340.001*
ASA  0.120.271
 II134 (86.5%)280 (90.3%)  
 III21 (13.5%)30 (9.7%)  
Gestational weeks37.8 ± 1.438.1 ± 1.30.240.018*
Birth weight (g)3024.3 ± 468.33059.6 ± 452.10.080.438
Previous uterine scar  0.011.000
 Yes28(18.1%)55 (17.7%)  
 No127(81.9%)255 (82.3%)  
Neonatal macrosomia  0.060.716
 Yes7 (4.5%)18 (5.8%)  
 No148 (95.5%)292 (94.2%)  
Multiple pregnancies  0.030.938
 Yes8 (5.2%)14 (4.5%)  
 No147 (94.8%)296 (95.5%)  
Anesthesia method  0.63<0.001*
 NA120 (77.4%)302 (97.4%)  
 GA35 (22.6%)8 (2.6%)  
Operation timing  0.001.000
 Elective86 (55.5%)172 (55.5%)  
 Emergency69 (44.5%)138 (44.5%)  
Operation duration (min)60.7 ± 16.157.9 ± 14.30.070.474
Preoperative PLT (×109/L)71.9 ± 13.0203.6 ± 41.54.29<0.001*
  1. Abbreviations: BMI body mass index, ASA American Society of Anesthesiologists classification of physical status, NA neuraxial anesthesia, GA general anesthesia
  2. Values are expressed as mean ± SD or number (percentage) of patients. Patients’ baseline characteristics were compared between groups using the standardized difference and p value, where a standardized difference smaller than 0.2 and p greater than 0.05 was considered as acceptable deviation between groups. The two groups were balanced in age, operation timing, ASA, the presence of underlying risk factors and operation duration. On the contrary, they were not balanced in BMI, gestational weeks and anesthesia method