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Table 3 Year of birth and red cell blood transfusion among women with a singleton pregnancy and postpartum haemorrhage, NSW, 2003–2011

From: Trends and outcomes of postpartum haemorrhage, 2003-2011

 

Vaginal births N = 46955

Caesarean births N = 11037

 

Unadjusted OR

Adjusted ORa

Unadjusted OR

Adjusted ORa

Year of birth

    

 2003

Ref

Ref

Ref

Ref

 2004

1.03 (0.90, 1.18)

1.03 (0.90, 1.18)

0.91 (0.70, 1.17)

0.90 (0.67, 1.17)

 2005

1.07 (0.94. 1.22)

1.08 (0.95, 1.24)

0.91 (0.70, 1.16)

0.92 (0.71, 1.18)

 2006

1.13 (0.99, 1.28)

1.13 (0.99, 1.29)

0.92 (0.72, 1.16)

0.88 (0.68, 1.13)

 2007

1.18 (1.04, 1.34)

1.15 (1.01, 1.31)

1.19 (0.94, 1.50)

1.11 (0.87, 1.42)

 2008

1.08 (0.95, 1.22)

1.05 (0.92, 1.19)

1.01 (0.80, 1.26)

0.96 (0.75, 1.23)

 2009

1.18 (1.04, 1.34)

1.15 (1.01, 1.31)

1.01 (0.80, 1.26)

0.97 (0.77, 1.24)

 2010

1.20 (1.06, 1.36)

1.16 (1.02, 1.31)

0.96 (0.77, 1.21)

0.91 (0.72, 1.16)

 2011

1.29 (1.15, 1.46)

1.23 (1.08, 1.39)

0.89 (0.71, 1.11)

0.84 (0.66, 1.06)

Maternal Age

    

 Under 20

 

1.29 (1.14, 1.46)

 

1.99 (1.47, 2.69)

 20–34

 

Ref

 

Ref

 35+

 

1.11 (1.03, 1.20)

 

1.11 (0.99, 1.25)

Private patient

 

0.87 (0.78, 0.96)

 

0.93 (0.78, 1.10)

Smoker

 

1.16 (1.07, 1.27)

 

0.98 (0.83, 1.16)

Parity

    

 1

    

 2–4

 

0.79 (0.74, 0.85)

 

1.25 (1.09, 1.44)

 5+

 

0.84 (0.72, 0.99)

 

2.13 (1.68, 2.71)

Australian born

 

0.95 (0.89, 1.01)

 

0.74 (0.66, 0.83)

Gestational Age

    

 20–32 weeks

 

1.21 (0.95, 1.54)

 

1.79 (1.40, 2.30)

 33–36 weeks

 

1.38 (1.20, 1.59)

 

1.07 (0.88, 1.29)

 37+ weeks

    

Mode of birth

    

 Vaginal

    

 Forceps

 

1.70 (1.55, 1.86)

  

 Vacuum

 

1.32 (1.21, 1.43)

  

 Caesarean in labour

   

1.57 (1.37, 1.79)

 Pre-labour caesarean

    

Induction

 

1.12 (1.06, 1.19)

 

1.01 (0.87, 1.16)

Large for gestational age

 

1.09 (1.01, 1.18)

 

1.13 (0.99, 1.28)

Chronic conditions

 

1.27 (1.03, 1.57)

 

1.23 (0.94, 1.62)

Pregnancy factors

    

 Antepartum haemorrhage

 

1.49 (1.30, 1.72)

 

1.47 (1.23, 1.76)

 Previous caesarean

 

1.43 (1.25, 1.63)

 

1.03 (0.89, 1.19)

 Previous PPH

 

1.40 (1.31, 1.51)

 

1.27 (1.12, 1.44)

 Malpresentation

 

1.07 (0.68, 1.69)

 

1.03 (0.87, 1.20)

 Morbidly adherent placenta

 

3.88 (3.32, 4.53)

 

5.21 (4.06, 6.68)

 Placenta praevia

   

3.09 (2.62, 3.65)

 Gestational diabetes

 

1.00 (0.89, 1.13)

 

0.92 (0.76, 1.10)

 Pregnancy hypertension

 

1.38 (1.26, 1.50)

 

1.12 (0.97, 1.31)

Hospital

    

 Tertiary

 

Ref

 

Ref

 Urban

 

1.05 (0.97, 1.14)

 

1.03 (0.87, 1.21)

 Regional

 

1.29 (1.20, 1.39)

 

1.54 (1.33, 1.79)

 Private

 

0.88 (0.77, 1.00)

 

1.64 (1.31, 2.05)

  1. Numbers in bold represent statistically significant adjusted risk or protective factors for transfusion. Chronic conditions included chronic hypertension, pre-existing diabetes, renal disease, cardiac disease. aAdjusted for all other variables in the column