Table 3 Summary of Multiple Linear Regression analysis for independent variables predicting sub-scales scores of “QLQ-C30/BR23” questionnaires

Global Health Status

37.3

 (Constant)

−8.897

6.750

−1.318

.189

 University Hospital

25.483

4.445

5.733

.000

 Mastectomy without reconstruction

−12.415

3.223

−3.852

.000

 Tertiary education

−13.005

4.385

−2.966

.003

 Hormonal Therapy

7.742

3.146

2.461

.015

 Chemotherapy

9.103

3.603

2.526

.012

Physical function

5.9

 (Constant)

82.505

1.266

65.150

.000

 No education

−16.351

4.686

−3.489

.001

Role function

6.3

 (Constant)

76.382

2.275

33.572

.000

 Mastectomy and reconstruction

−14.235

3.952

−3.602

.000

Emotional function

7.1

 (Constant)

66.408

9.156

7.253

.000

 Radiotherapy

−7.687

4.006

−1.919

.057

 Urban center

9.756

4.056

2.405

.017

 Chemotherapy

10.683

4.727

2.260

.025

 Secondary school

−12.648

6.323

−2.000

.047

Cognitive function

7.7

 (Constant)

86.346

2.492

34.648

.000

 Athens Metropolitan Area

−7.729

3.535

−2.186

.030

 No education

−15.512

5.636

−2.752

.007

 Mastectomy without reconstruction

6.596

3.121

2.113

.036

Social function

10.3

 (Constant)

16.910

18.818

.899

.370

 Mastectomy without reconstruction

12.125

3.426

3.540

.001

 Complications

29.805

9.491

3.140

.002

Fatigue

1.8

 (Constant)

47.681

7.293

6.538

.000

 Sentinel Lymph Node Biopsy

−8.160

3.999

−2.041

.043

Pain

11

 (Constant)

26.459

9.123

2.900

.004

 Age

−.388

.130

−2.988

.003

 Radiotherapy

8.662

3.228

2.683

.008

 Athens Metropolitan Area

9.479

3.728

2.542

.012

Dyspnea

2.7

 (Constant)

40.054

8.160

4.909

.000

 Sentinel Lymph Node Biopsy

−10.887

4.474

−2.433

.016

Insomnia

2.4

 (Constant)

30.893

3.069

10.066

.000

 Urban center

−10.807

4.636

−2.331

.021

Appetite loss

5.9

 (Constant)

−7.786

5.691

−1.368

.173

 Radiotherapy

12.060

3.473

3.473

.001

Constipation

17.1

 (Constant)

−4.220

6.180

−.683

.496

 Athens Metropolitan Area

24.521

4.235

5.790

.000

 Radiotherapy

8.378

3.710

2.258

.025

Diarrhea

7.5

 (Constant)

16.586

7.164

2.315

.022

 Hormonal therapy

6.849

2.528

2.709

.007

 University Hospital

−5.744

2.378

−2.415

.017

 Sentinel Lymph Node Biopsy

−6.763

2.865

−2.360

.019

Financial difficulties

5.6

 (Constant)

18.895

2.871

6.582

.000

 Rural area

17.468

5.164

3.383

.001

Body image

27.3

 (Constant)

44.092

22.231

1.983

.049

 University Hospital

−25.415

5.139

−4.945

.000

 Complications

39.184

10.447

3.751

.000

 Mastectomy and reconstruction

−12.835

4.566

−2.811

.006

 Secondary school

−21.429

6.700

−3.198

.002

 Rural area

−11.661

4.635

−2.516

.013

Sexual function

31.6

 (Constant)

−8.897

6.750

−1.318

.189

 University hospital

25.483

4.445

5.733

.000

 Mastectomy without reconstruction

−12.415

3.223

−3.852

.000

 High school

−13.005

4.385

−2.966

.003

Sexual enjoyment

3.8

 (Constant)

48.315

2.127

22.719

.000

 Mastectomy without reconstruction

−8.489

3.008

−2.823

.005

Future perspective

9.1

 (Constant)

73.823

12.419

5.944

.000

 Mastectomy and reconstruction

15.392

5.441

2.829

.005

 Age

−.446

.205

−2.172

.031

 Secondary school

16.274

7.884

2.064

.040

Systemic therapy side effects

1.7

 (Constant)

26.359

2.027

13.007

.000

 Urban center

−6.133

3.061

−2.003

.047

Breast symptoms

9.1

 (Constant)

68.423

15.265

4.482

.000

 Athens Metropolitan Area

19.068

3.044

6.264

.000

 Complications

−22.728

7.273

−3.125

.002

 Age

−.269

.106

−2.539

.012

Arm symptoms

21.8

 (Constant)

32.808

8.400

3.905

.000

 Athens Metropolitan Area

10.801

3.280

3.293

.001

 Sentinel Lymph Node Biopsy

−7.558

3.329

−2.270

.024

 Age

−.335

.111

−3.012

.003

 Chemotherapy

9.455

3.244

2.915

.004

 No education

12.124

5.194

2.334

.021

Upset by hair loss

9.2

 (Constant)

50.282

5.536

9.082

.000

 Chemotherapy

−14.581

4.103

−3.554

.000

 High school

10.011

3.731

2.683

.008