Table 1 Baseline characteristics in the two study groups.

From: Vitamin D Supplementation for Premenstrual Syndrome-Related inflammation and antioxidant markers in students with vitamin D deficient: a randomized clinical trial

Group

Vitamin D group

N = 20

Placebo group

N = 18

P-valuea

Age, years

21.3 ± 1.6

21.7 ± 1.8

0.41

BMI, kg/m2

20.7 ± 1.2

21.4 ± 2.01

0.21

Waist circumference, Cm

77 ± 8.4

80 ± 10.01

0.59

Menarche age, n (%)

  

0.51

   <12 years

9(40.9)

9(45)

 

   ≥12 years

13(59.1)

11(55)

 

Having previous history of PMS (%)

12(54.5)

12(60)

0.48

Habit of adding salt to the table, yes(%)

10(47.6)

9(45)

0.55

Coffee consumption, n (%)

  

   ≤2 cups/day

22(100)

20(100)

 

   >2 cups/day

0

0

 

Sun exposure (min/day), n (%)

  

0.78

   <30

6(27.3)

8(40)

 

   30–60

11(50)

9(45)

 

   60–120

4(18.2)

2(10)

 

   >120

1(4.5)

1(5)

 

Using sunscreen, yes(%)

15(68.2)

17(85)

0.18

Body on sun expose, n (%)

  

0.20

   Only face and hands

18(81.8)

19(95)

 

   More

4(18.2)

1(5)

 

Serum 25(OH)D3, ng/mL

21.4 ± 7.6

21.1 ± 6.8

0.86

Serum IL-10, Pg/mL

92 ± 8

84 ± 35

0.49

Serum IL-12, ng/mL

18 ± 3

19 ± 24

0.89

Serum TAC, U/mL

13 ± 2

19 ± 11

0.064

  1. aResulted from independent t-test for quantitative and chi-square test for categorical variables Q uantitative variables: mean ± SD Qualitative variables: frequency (percentage).
  2. BMI, body mass index.