3.1. Acute exacerbation
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After 52-weeks of treatment, the Tai Chi group had 132 acute exacerbations, and the control group had 205, resulting in 1.04 exacerbations per patient year with Tai Chi treatment versus 1.34 with standard care (Comparison of time to first exacerbation event in patients of 2 groups.Comparison of time to second exacerbation event in patients of 2 groups.