During period 2, the subjects in group I were given normal yogurt (non-probiotic) and the subjects in group II were given probiotic-containing probiotic for 2 weeks (200g daily).
Ở giai đoạn 2, nhóm I ăn sữa chua thường (không chứa probiotic), nhóm II ăn sữa chua chứa probiotic trong 2 tuần.