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Table 2 IBS score and GI symptoms at the beginning and end of the trial

From: The effect of melatonin on irritable bowel syndrome patients with and without sleep disorders: a randomized double-blinded placebo-controlled trial study

Variable

Group with sleep disorders

Group without sleep disorders

Baseline

After Intervention

Baseline

After Intervention

IBS Score

Melatonin

Mild

2 (5.8%)

20 (58.8%)

5 (14.7%)

20 (58.8%)

Moderate

16 (47.1%)

9 (26.5%)

13 (38.2%)

9 (26.5%)

Severe

16 (47.1%)

5 (14.7%)

16 (47.1%)

5 (14.7%)

Placebo

Mild

5 (14.7%)

10 (29.4%)

2 (5.8%)

8 (23.5%)

Moderate

15 (44.1%)

15 (44.1%)

21 (61.8%)

22 (64.7%)

Severe

14 (41.2%)

9 (26.5%)

11 (32.3%)

4 (11.8%)

P-Value

0.424

0.022*

0.536

0.025*

Severity of Abdominal Pain

Melatonin

No Pain

0 (0%)

9 (26.5%)

0 (0%)

7 (20.6%)

Not Very Severe

15 (44.1%)

18 (52.9%)

8 (23.5%)

16 (47.1%)

Quite Severe

8 (23.5%)

5 (14.7%)

22 (64.7%)

10 (29.4%)

Severe

8 (23.5%)

2 (5.9%)

4 (11.8%)

1 (2.9%)

Very Severe

3 (8.8%)

0 (0%)

0 (0%)

0 (0%)

Placebo

No Pain

0 (0%)

4 (11.8%)

0 (0%)

4 (11.8%)

Not Very Severe

18 (52.9%)

17 (50%)

14 (41.2%)

10 (29.4%)

Quite Severe

6 (17.6%)

5 (14.7%)

14 (41.2%)

17 (50%)

Severe

7 (20.6%)

6 (17.6%)

6 (17.6%)

3 (8.8%)

Very Severe

3 (8.8%)

2 (5.9%)

0 (0%)

0 (0%)

P-Value

0.575

0.034*

0.384

0.033*

Frequency of Abdominal Pain in 10 days

Melatonin

Median

5.5

3

5

3

Q1

4

0

4

2

Q3

9

6.25

7.25

4.5

Placebo

Median

4

4

5

5

Q1

4

3

3

3

Q3

9

8

7

6

P-Value

0.623

0.019*

0.170

0.010*

Severity of Abdominal Bloating

Melatonin

No Bloating

0 (0%)

8 (23.5%)

0 (0%)

17 (50%)

Not Very Severe

16 (47.1%)

19 (55.9%)

8 (23.5%)

12 (35.3%)

Quite Severe

9 (26.5%)

4 (11.8%)

22 (64.7%)

5 (14.7%)

Severe

7 (20.6%)

3 (8.8%)

4 (11.8%)

0 (0%)

Very Severe

2 (5.9%)

0 (0%)

0 (0%)

0 (0%)

Placebo

No Bloating

0 (0%)

2 (5.9%)

1 (2.9%)

7 (20.6%)

Not Very Severe

19 (55.9%)

17 (50%)

14 (41.2%)

14 (41.2%)

Quite Severe

10 (29.4%)

11 (32.4%)

16 (47.1%)

11 (32.3%)

Severe

5 (14.7%)

4 (11.8%)

2 (5.9%)

1 (2.9%)

Very Severe

0 (0%)

0 (0%)

1 (2.9%)

1 (2.9%)

P-Value

0.292

0.018*

0.261

0.005*

Satisfaction with Bowel Habits

Melatonin

Very Happy

0 (0%)

10 (29.4%)

0 (0%)

5 (14.7%)

Quite Happy

5 (14.7%)

14 (41.2%)

6 (17.6%)

13 (38.2%)

Unhappy

24 (70.6%)

7 (20.6%)

24 (70.6%)

14 (41.2%)

Very Unhappy

5 (14.7%)

3 (8.8%)

4 (11.8%)

2 (5.9%)

Placebo

Very Happy

0 (0%)

2 (5.9%)

0 (0%)

0 (0%)

Quite Happy

7 (20.6%)

10 (29.4%)

2 (5.9%)

9 (26.5%)

Unhappy

23 (67.6%)

19 (55.9%)

29 (85.3%)

22 (64.7%)

Very Unhappy

4 (11.8%)

3 (8.8%)

3 (8.8%)

3 (8.8%)

P-Value

0.512

0.004*

0.436

0.018*

Disease's Impact on Patient's Life

Melatonin

Not at All

0 (0%)

9 (26.5%)

0 (0%)

4 (11.8%)

Not Much

3 (8.8%)

11 (32.3%)

2 (5.8%)

18 (52.9%)

Quite a Lot

18 (52.9%)

10 (29.4%)

22 (64.7%)

10 (29.4%)

Completely

13 (38.2%)

4 (11.8%)

10 (29.4%)

2 (5.8%)

Placebo

Not at All

0 (0%)

2 (5.8%)

0 (0%)

0 (0%)

Not Much

2 (5.8%)

7 (20.6%)

5 (14.7%)

10 (29.4%)

Quite a Lot

18 (52.9%)

15 (44.1%)

22 (64.7%)

20 (58.8%)

Completely

14 (41.2%)

10 (29.4%)

7 (20.6%)

4 (11.8%)

P-Value

0.720

0.004*

0.222

0.003*

Frequency of Defecations per Week

Melatonin

Median

3.5

2

4

2

Q1

2

1

1

1

Q3

4

3

5

4

Placebo

Median

2

2

3

2

Q1

1

1

2

2

Q3

4

4

4

3.25

P-Value

0.165

0.573

0.449

0.361

Stool Consistency

Melatonin

Normal

5 (14.7%)

19 (55.9%)

0 (0%)

21 (61.8%)

Not Normal

29 (85.3%)

15 (44.1%)

34 (100%)

13 (38.2%)

Placebo

Normal

3 (8.8%)

5 (14.7%)

2 (5.8%)

5 (14.7%)

Not Normal

31 (91.2%)

29 (85.3%)

32 (94.1%)

29 (85.3%)

P-Value

0.455

 < 0.001*

0.154

0.029*

Quality of Life Improvement

Melatonin

Yes

23 (67.6%)

21 (61.8%)

No

11 (32.4%)

13 (38.2%)

Placebo

Yes

9 (26.5%)

12 (35.3%)

No

25 (73.5%)

22 (64.7%)

P-Value

0.001*

0.030*