Table 4 Within- and between-group comparison of changes in mean score of the total PMS symptoms 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

 

Vitamin D group

N = 20

Placebo group

N = 18

P-valuea

Adjusted P-valueb

Baseline

39 ± 8

35 ± 10

<0.001

<0.001

Post-intervention

21 ± 6

28 ± 8

Mean difference(%95 CI)

−18 (−21.5,−14.8)

−7.0 (−9.5,−4.5)

P-value

<0.001

<0.001

  1. aResulted from independent samples t-test based on comparing mean difference between two groups.
  2. bResulted from ANOCOVA based on comparing post-intervention values after adjustment for baseline values of outcomes, energy and vitamin E intake.
  3. Data are shown as mean ± SD.
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