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Table 5 Perceived stress scale measurement items (PSS-10) at baseline and after the 12-week intervention in subjects with polycystic ovary syndrome

From: Synbiotic as an ameliorating factor in the health-related quality of life in women with polycystic ovary syndrome. A randomized, triple-blind, placebo-controlled trial

PSS-10 Descriptive statistics

assessment time

Intervention group N = 28

Control group N = 24

P**

P***

In the Last Month, How Often Have You:

1- Been upset because of something that happened unexpectedly?

Baseline

End of trial

Change

P*

2.28 ± 1.01

2.64 ± 1.12

0.35 ± 1.19

0.125

2.66 ± 1.27

2.50 ± 0.97

-0.16 ± 1.09

0.461

0.236

0.631

0.107

0.161

2- Felt that you were unable to control the important things in your life?

Baseline

End of trial

Change

P*

2.50 ± 0.95

2.28 ± 1.04

-0.21 ± 0.99

0.264

2.54 ± 1.28

2.45 ± 1.25

-0.08 ± 0.113

0.723

0.894

0.591

0.660

0.752

3- Felt nervous and “stressed”?

Baseline

End of trial

Change

P*

2.46 ± 1.07

2.35 ± 1.06

-0.10 ± 1.16

0.631

2.70 ± 1.04

2.70 ± 1.12

0.00 ± 1.21

1.00

0.411

0.252

0.747

0.669

4- Felt confident about your ability to handle your personal problems? R

Baseline

End of trial

Change

P*

1.82 ± 1.02

1.75 ± 0.92

-0.07 ± 1.15

0.745

1.50 ± 1.06

1.50 ± 1.02

0.00 ± 1.17

1.00

0.272

0.360

0.826

0.735

5- Felt that things were going your way? R

Baseline

End of trial

Change

P*

2.35 ± 0.86

2.17 ± 0.81

-0.17 ± 1.05

0.379

2.12 ± 1.03

1.87 ± 1.07

-0.25 ± 1.42

0.398

0.384

0.254

0.837

0.342

6- Found that you could not cope with all the things that you had to do?

Baseline

End of trial

Change

P*

2.11 ± 0.97

1.96 ± 0.79

-0.11 ± 0.89

0.523

2.00 ± 1.06

2.29 ± 1.23

0.29 ± 1.12

0.216

0.699

0.254

0.160

0.051

7- Been able to control irritations in your life? R

Baseline

End of trial

Change

P*

2.03 ± 0.79

1.89 ± 0.91

-0.14 ± 0.97

0.443

1.70 ± 0.95

1.83 ± 0.91

0.12 ± 1.07

0.575

0.183

0.816

0.350

0.956

8- Felt that you were on top of things? R

Baseline

End of trial

Change

P*

2.32 ± 0.77

2.14 ± 0.89

-0.17 ± 0.90

0.306

2.12 ± 0.94

1.95 ± 0.99

-0.16 ± 1.09

0.461

0.414

0.485

0.966

0.630

9- Been angered because of things that were outside of your control?

Baseline

End of trial

Change

P*

2.25 ± 0.92

2.35 ± 0.95

0.10 ± 0.99

0.573

2.62 ± 0.92

2.37 ± 1.24

-0.25 ± 0.94

0.207

0.152

0.954

0.192

0.482

10- Felt difficulties were piling up so high that you could not overcome them?

Baseline

End of trial

Change

P*

2.39 ± 1.10

2.46 ± 1.07

0.07 ± 1.05

0.722

2.41 ± 1.34

2.12 ± 1.32

-0.29 ± 1.23

0.258

0.944

0.313

0.257

0.118

Total score

Baseline

End of trial

Change

P*

22.55 ± 5.97

22.03 ± 6.25

-0.37 ± 5.74

0.740

22.41 ± 7.81

21.62 ± 8.12

-0.79 ± 5.94

0.520

0.943

0.838

0.798

0.811

Cronbach’s alpha

Baseline

End of trial

0.828

0.847

0.889

0.894

   
  1. R reverse scored item
  2. P*: p-values for comparison within groups via paired t-test.
  3. P*: p-values for comparison between groups via independent t-test.
  4. P***: p-values based on an ANCOVA model adjusted with baseline value of the outcome, age, marital status, PCOS duration and mean changes in BMI, waist circumference and hip circumference.