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Table 3 Multiple logistic regression predicting patient’s post-operative physical health (PCS)

From: Patients’ and partners’ health-related quality of life before and 4 months after coronary artery bypass grafting surgery

Patient’s post-op physical health (PCS) (dependent variable)

 

95.0% C.I

 

Beta

S.E.

Wald

d

p

Lower

Upper

Patient pre-op (independent) variables

Step 1: chi square = 29.075, -2 Log Likelihood = 76.776, R = .305, Nagelkerke R 2= .415

PCS

-.131

.037

12.016

1

0.001**

.816

.945

MCS

-.075

.027

7.616

1

0.006*

.880

.979

Step 2: chi square =7.864, -2 Log Likelihood =68.911, R = .370, Nagelkerke R 2= .504

PCS

-.214

.006

10.403

1

0.001**

.709

.919

MCS

-.110

.036

9.182

1

0.002*

.834

.962

Physical limitation

.007

.022

.086

1

0.769

.964

1.051

Angina freq/severity

.053

.028

3.541

1

0.060

.998

1.114

Constant

9.311

2.511

13.753

1

<0.001

-

-

Partner pre-op (independent) variables

Step 1: chi square = 12.425, -2 Log Likelihood = 93.425, R = .144, Nagelkerke R 2= .19

PCS

-.059

.029

5.743

1

0.007*

.883

.988

MCS

-.038

.025

2.335

1

0.126

.917

1.011

Step 2: chi square = .002, -2 Log Likelihood = 3.423, R = .144, Nagelkerke R 2= .106

PCS

-.069

.030

5.321

1

0.021*

.880

.990

MCS

-.039

.032

1.499

1

0.221

.904

1.024

EFD

.001

.023

.002

1

0.968

.956

1.048

Step3: chi square = 4.515, -2 Log Likelihood = 88.909, R = .191, Nagelkerke R 2= .260

PCS

-.069

.033

3.739

1

0.050*

.878

1.001

MCS

-.067

.036

3.393

1

0.065

.872

1.004

EFD

.028

.029

1.077

1

0.316

.974

1.086

Social deprivation

−1.899

1.006

3.559

1

0.059

.021

1.077

Constant

6.547

1.971

11.029

1

<0.001

-

-

  1. PCS physical component score, MCS mental component score, EFD emotion functioning dimension, angina freq/severity angina frequency and severity, post-op post-operative, * p < 0.005; ** p < 0.001.