Compared to controls , participants randomized to the intervention increased their @-minute walk distance from baseline to @-month follow-up , ( from @ to @ m in the intervention versus @ to @ m in the control group ; mean difference = +@ m ; @ % confidence interval -LSB- CI -RSB- = +@ , +@ ; P < @ ) and their Walking Impairment Questionnaire ( WIQ ) speed score ( from @ to @ in the intervention group versus @ to @ in the control group ; mean difference = +@ ; @ % CI = +@ , +@ ; P = @ ) .