【Purpose】The purpose of this study is to propose a prediction methodology based on the statistics of the cause of falls to provide information in making decisions such as the use of assistive devices and environmental improvement.

【Method】The relation between the internal factors of falls and the immediate cause of the falls was organized using a tree diagram. A method to predict fall frequency was proposed based on the relative risk using the extracted fall factors. The proposed prediction methodology was verified by checking its validity with records detailing the number of falls over a two-year period for three elderly people.

【Result】As a results of validity verification by an accumulated six years’ worth of records for three elderly people living in the same facility, five of the six examples were found to be correctly estimated.

【Conclusion】A novel prediction methodology, which calculate the frequency of falls based on four internal factors of falling, was proven to be valid.

【Purpose】The purpose of this study was to examine the relationship between the backward–forward two-step test and walking speed in normal young subjects.

【Methods】The study included 125 normal young subjects. Measurements of the backward two-step test, forward two-step test, backward ten-meter gait, and forward ten-meter gait were analyzed. Correlation coefficient and regression equation were analyzed between the two-step tests and walking speed. In addition, the walking speed estimated value was calculated by substituting two-step for each regression equation. Discrepancies between the walking speed estimated and measured values were calculated using Bland–Altman analysis.

【Results】There was a significant correlation between the backward–forward two-step test and walking speed (backward: r ＝ 0.522, p < 0.001; forward: r ＝ 0.466, p < 0.001). Bland–Altman analysis revealed proportional bias.

【Conclusion】The study showed that the backward–forward two-step test and walking speed had middle correlation and proportional bias in normal young subjects. However, this study did not confirm the efficacy of the two-step test for estimating gait activity.

【Objective】The present study was conducted to investigate the characteristics of the patients who experienced fall-related injuries during their stay at convalescent rehabilitation ward.

【Methods】A total of 161 patients (210 falls) whose medical records included information regarding the incidence of falls were enrolled in this study. Medical information of the patients was obtained from their medical records, and the situations related to the fall were assessed on the basis of a retrospective investigation of the incident reports. The participants were distinguished into groups depending on whether they suffered a fall-related injury. Each factor was examined statistically, and the probability of the occurrence of a fall-related injury was analyzed, by evaluating the difference in hospitalization days, scene, and association with movement.

【Results】The results showed that 38 people suffered fall-related injuries, and 123 did not. The participants who suffered fall-related injuries were young, and their motor Functional Independence Measure (FIM) was high. The number of falls decreased with hospitalization days, but the number of fall-related injuries increased. The probability of a fall-related injury was related to scene at home, and association with walking.

【Conclusion】Young patients with high motor FIM were increased risk of a fall-related injury. The probability of a fall-related injury was related to hospitalization days, scene at home, and association with walking.