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Table 8 Multivariable logistic regression analysis

From: Determinants of peri-operative blood transfusion in a contemporary series of open prostatectomy for benign prostate hyperplasia

Variables in the Equation

Predictor Variables

B

S.E.

Wald (chi-square)

df

p-value

odd ratio

95 % C.I.for odd ratio

 

Lower

Upper

Pre-operative Hb (Anaemia)

−2.352

.507

21.517

1

.000

.095

.035

.257

Surgery time (Duration of surgery)

.020

.009

5.021

1

.025

1.021

1.003

1.039

Age category

−.212

.616

.119

1

.730

.809

.242

2.705

ASA score

−.369

.475

.605

1

.437

.691

.273

1.753

Systolic blood pressure

−.120

.334

.128

1

.720

.887

.461

1.708

Anesthesia

.585

.648

.814

1

.367

1.794

.504

6.390

Status of operating surgeon

1.039

.618

2.828

1

.093

2.827

.842

9.489

Operative prostate weight

.003

.004

.524

1

.469

1.003

.996

1.010

Constant

1.651

2.384

.479

1

.489

5.211

  
  1. Therefore, the multivariable logistic regression is given by
  2. Log (transfused) = 1.651 – 2.352X1 + 0.020X2 – 0.212X3 – 0.369X4 – 0.120X5 + 0.585X6 + 1.039X7 + 0.003X8
  3. Variable(s) entered on step 1: hb (anaemia), surgery time, age category, ASA score, systolic, anaesthesia, status of surgeon, operative prostate weight
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BMC Urology

ISSN: 1471-2490

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