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Table 1 Characteristics of the study population in the training and validation sets

From: A risk prediction model of perinatal blood transfusion for patients who underwent cesarean section: a case control study

Variables

Training set (n = 241)

Validation set (n = 148)

P

Age, means ± SD (years)

31.61 ± 4.73

31.94 ± 4.92

0.509

Gestational age, Medians (lower quartile, upper quantile) (days)

272 (266–277)

271 (264–278)

0.610

Number of previous deliveries, n (%)

  

0.605

  0

94 (39.00)

55 (37.16)

 

  1

130 (53.94)

80 (54.05)

 

  2

17 (7.05)

13 (8.78)

 

Number of abortions, n (%)

  

0.863

  0

109 (45.23)

71 (47.97)

 

  1

76 (31.53)

47 (31.76)

 

  2

38 (15.77)

20 (13.51)

 

  3 or more

18 (7.47)

10 (6.76)

 

Number of previous cesarean deliveries, n (%)

  

0.931

  0

117 (48.55)

71 (47.97)

 

  1

110 (45.64)

67 (45.27)

 

  2

14 (5.81)

10 (6.76)