The primary outcome was the incidence of falls, which was ascertained on a monthly basis. Participants were asked to use a daily “fall calendar” diary to record any fall event (defined as “when you land on the floor or the ground, or fall and hit objects like stairs or pieces of furniture, by accident”) and to indicate whether they sought medical attention. Information was also collected on injurious falls. Data on falls were collected starting from the date of the first intervention class and continuing until 24 weeks later (ie, the end of the intervention period) or until a participant withdrew, died, or was lost to follow-up.