Estimated mean slope values (estimated change per visit) and 95% confidence intervals for changes in gait speed and executive function z-score for participants randomly assigned to six months of Tai Chi training plus usual care or to usual care alone.

<p>Estimated mean slope values (estimated change per visit) and 95% confidence intervals for changes in gait speed and executive function z-score for participants randomly assigned to six months of Tai Chi training plus usual care or to usual care alone.