Table 2. Co-contraction for the usual care and randomized to Tai Chi groups at their baseline and 6 month visits.

Outcome Measure	Tai Chi (n = 23)				Usual Care (n = 26)				Group x Time
	Baseline		6 Month		Baseline		6 Month		ST	DT
	ST*	DT*	ST*	DT*	ST*	DT*	ST*	DT*	Mean difference (95% CI)	Mean difference (95% CI)
Co-contraction index (%)	41.3 (37.8, 44.9)	43.9 (40.7, 47.1)	39.2 (35.2, 43.2)	40.1 (36.4, 43.8)	41.3 (37.8, 44.9)	43.9 (40.7, 47.1)	38.0 (34.1, 41.8)	40.2 (36.7, 43.7)	1.2 (-3.8, 6.2)	-0.1 (-4.7, 4.5)

Age-adjusted random-slopes model with a shared baseline.

*ST and DT provided as age adjusted mean (95% CI)