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Table 5 Comparison of menstrual pain intensity in two groups before, at the first and at the second stage of the intervention as measured by the visual analog scale

From: The role of water intake in the severity of pain and menstrual distress among females suffering from primary dysmenorrhea: a semi-experimental study

Intensity of menstrual pain

Stage

Control group (n = 70)

Water intake group (n = 70)

p value*

Mean (SD)

Mean (SD)

The first day of menstrual bleeding

    
 

Before intervention

7.64 (2.16)

7.06 (2.21)

0.06

 

The first menstrual cycle after intervention

7.36 (1.87)

5.84 (2.22)

0.007

 

The second menstrual cycle after intervention

7.67 (1.92)

5.06 (2.43)

< 0.001

 

p value**

0.004

< 0.0001

 

The second day of menstrual bleeding

    
 

Before intervention

4.94 (2.19)

4.43 (2.86)

0.176

 

The first menstrual cycle after intervention

4.57 (1.95)

3.50 (2.43)

0.058

 

The second menstrual cycle after intervention

4.71 (2.04)

3.34 (2.97)

0.385

 

p value**

0.148

< 0.0001

 

The third day of menstrual bleeding

    
 

Before intervention

2.20 (1.58)

2.61 (2.87)

1.000

 

The first menstrual cycle after intervention

2.13 (1.38)

1.67 (2.34)

0.486

 

The second menstrual cycle after intervention

2.43 (2.42)

1.29 (1.61)

0.004

 

p value**

0.485

< 0.0001

 
  1. *Mann–Whitney U t-test
  2. **Related samples Friedman’s two-ways analysis of variance