Skip to main content

Table 7 Multivariable analysis of blood loss

From: Estimated blood loss in pregnant women with cardiac disease compared with low risk women: a restrospective cohort study

 

Coefficient (95% CI)

p-Value

mWHO Grade

 

0.165

Controls

1–2

−2.2% (−13.9, 11.2%)

0.739

3–4

19.7% (− 1.2, 45.0%)

0.066

Age at Delivery (per Decade)

4.6% (1.2, 8.2%)

0.008

BMI (per 10 kg/m2)

1.0% (−2.9, 5.1%)

0.624

Parity

 

< 0.001

0

1

−11.0% (−14.6, −7.2%)

< 0.001

2

−16.9% (−21.4, − 12.3%)

< 0.001

3+

−19.9% (− 25.0, − 14.5%)

< 0.001

Gestation at Delivery (Completed weeks)

−0.1% (− 1.7, 1.5%)

0.889

Baby Weight (per kg)

28.6% (23.4, 34.1%)

< 0.001

Mode of Delivery

 

< 0.001

Spontaneous Vaginal

Ventouse

23.3% (15.0, 32.3%)

< 0.001

Forceps

47.5% (39.2, 56.2%)

< 0.001

Caesarean Section

121.1% (107.4, 135.6%)

< 0.001

Manual Removal

 

< 0.001

No

Yes

59.1% (30.3, 94.1%)

< 0.001

  1. Results are from a multivariable general linear model. Blood loss followed a skewed distribution, and so was log2-transformed, before being set as the dependent variable. The resulting coefficients from the model were anti-logged, and converted into percentage differences. As such, for continuous variables, the reported values represent the percentage increase in blood loss associated with the stated increase in the factor whilst, for the nominal variables, the values are the percentage increase in blood loss in the stated group, relative to the reference. After excluding cases with missing data, the final model was based on N = 4573. Bold p-values are significant at p < 0.05