Table 4

Coefficient, standard error and significance of the variables of the final model of logistic regression analysis; estimated equation for calculating the probabilities and some examples calculated [n = 32,533]
Variables
 Coefficient
 Standard error of the coefficient
 p
Admission to ICU with severe infection
 3.1320
 0.4564
 < 0.0001
Admission to ICU
 2.5677
 0.2283
 < 0.0001
Severe preeclampsia with severe hemorrhage
 4.6209
 0.6360
 < 0.0001
Cerebral disorder
 3.1013
 0.7710
 < 0.0002
HIV-related disease
 2.5265
 0.7502
 0.0008
Emergency hysterectomy with severe hemorrhage
 3.1746
 0.8221
 < 0.0002
Severe preeclampsia
 -1.0093
 0.2669
 < 0.0005
Admission to ICU with severe hemorrhage
 -2.3838
 0.9754
 0.0145
Vascular disorder
 2.8264
 0.7983
 < 0.0005
Severe infection
 -0.8317
 0.3202
 0.0094
Emergency hysterectomy
 0.6534
 0.5433
 0.2292
Severe hemorrhage
 -0.6591
 0.3143
 0.0360
Constant
 -5.4710
 0.1912
 < 0.0001




Estimated equation:


Prob(death) = 1/(1+exp(-(-5.4710 +3.1320 × Int(ICU, Infection) + 2.5677 × ICU + 4.6209 × Int(Preeclampsia, Hemorrhage) + 3.1013 × Cerebral disorder + 2.5265 × HIV + 3.1746 × Int(Hysterectomy, Hemorrhage) - 1.0093 × Preeclampsia + -2.3838 × Int(ICU, Hemorrhage) + 2.8264 × Vascular disorder - 0.8317 × Infection + 0.6534 × Hysterectomy - 0.6591 × Hemorrhage)))




Examples:
 Prob (death)

Admission to ICU with severe infection
 0.3537

Emergency hysterectomy with severe hemorrhage
 0.0910

Cerebral disorder
 0.0855

Severe preeclampsia with severe hemorrhage
 0.0746

Vascular disorder
 0.0663

Admission to ICU
 0.0520

HIV-related disease
 0.0500

Emergency hysterectomy
 0.0080

Admission to ICU with severe hemorrhage
 0.0026

Severe hemorrhage
 0.0022

Severe infection
 0.0018

Severe preeclampsia
 0.0015

Sousa et al. Reproductive Health 2008 5:6   doi:10.1186/1742-4755-5-6

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