Keywords: vitamin D;dysmenorrhea;systemic review meta-analysis (SRMA);randomized controlled trials (RCTs);pain relief;pain degree;Cochrane risk-of-bias (RoB 2)
(25-hydroxyvitamin D < 20 ng/mL) after treatment demonstrated an increase in LF:HF (conventional: n = 13, ∆LF:HF: 0.20 ± 0.06, p < 0.001 vs. insufficient and sufficient vitamin D groups; intensive: n = 8: ∆LF:HF: 0.15 ± 0.06, p < 0.001 vs. sufficient vitamin D group)....
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