In elderly, the progressive degenerations in the nervous system and vestibular system compromise the human body balance leading to a greater risk of falls. The deteriorated gait compromises the capacity and functional autonomy and impacting negatively the quality of life. There are differences in gait efficiency that are related to the life cycles, it is noted that it reaches its maximum efficiency at the end of childhood and declines progressively over the years with senescence. The gait gets worse and affects functional capacity in elderly and, compromises independence, autonomy and increases the rates of falls. To evaluate the gait, the Dynamic Gait Index (DGI)  was suggested to document the patient’s ability to change gait in response to changes in their eight tasks. The DGI was validated in Brazil  in 2016. It’s possible to hypothesize that each task of the DGI affects the final score. The objective of this study was to analyze the results of the application of the Dynamic Gait Index-Brazilian brief version and establish correlation with the original protocol.
Retrospective, descriptive and qualitative study approved by the Ethics and Research Committee of the Federal University of Sergipe (number 0197.0.107000.09). We analyzed 223 patient files with evaluations of socially active elderly, female gender, aged ranged 60 to 85 years. The base data was collected on five towns of Sergipe state on northweast of Brazil since 2014. All patients with ability to respond to the DGI tasks was included. Patients with impaired verbal comprehension, motor and locomotion difficulties, visual and auditory deficiency, degenerative neurological diseases were excluded. To evaluate balance and gait, the Dynamic Gait Index-Brazil (DGI)  (Table 1) was used to identify future risk of falls. This study followed three steps.
In the first stage, it was verified 63 volunteers with risk of falls and the study of possible correlations between the performance between the tasks and each one of them and the result of the general performance in the DGI-Brazil  was carried out. It was hypothesized that each task would contribute with greater or lesser influence on the final scores and became the protocol sensitive to identify risks of falls. From the exclusion of tasks 1; 2 and 7 were defined the DGI-Brazilian brief version composed of five (5) tasks and cut point equal or less than 11 (Table 2).
In the second step of the study, all sample data was analyzed through DGI-Brazilian brief version and the possible correlations between the two versions were established in the third step.
Table 1. Dynamic Gait Index-Brazil2 taks.
Table 2. Dynamic Gait Index-Brazilian brief taks.
For the statistical analysis it was adopted as dependent variable the response of each volunteer in the DGI, the total scores in each version and which independent variable the final average in each task. It was used the Soft R Project: 3.12 to perform the descriptive measures, the Pearson Correlation Moment Product Coefficient test (p ≤ 0.05), the Chi-square test and the Pearson Correlation Matrix (r = 1.0).
3. Results and Discussion
It was possible identified 63 (28.0%) subjects with risks to fall with the DGI in its original version. The mean age of this sample was 68.54 (±7.61) years. The Pearson Correlation Moment Product Coefficient test between each task showed a positive correlation between T1 and T2 (r = 0.37); T1 and T8 (r = 0.26); T3 and T4 (r = 0.42); T3 and T5 (r = 0.25); T4 and T5 (r = 0.33); T2 and T4 (r = 0.30) and T2 with T7 (r = 0.20). There was a negative correlation between T4 with T8 (r = −0.29. It was no found correlations withT6. Statistical analysis indicated that T1, T2 and T7 did not contribute to decrease the total score in the test and that the worst performances occurred in Tasks 3, 5 and 6.
These results pointed five tasks were more sensitive to identify risk of falls and allowed claim that DGI-Brazilian Brief could be apply for clinical proposals (Figure 1).
At second step of the study, the 223 patient’s records were reviewed by the proposal of the Brazilian DGI-brief. Statistical date suggested11 points as cut
Figure 1. The Pearson Correlation Moment Product Coefficient test Matrix between each task of 63 socially active volunteers (p ≤ 0.05). Legend: T = task.
score. It was possible identified 65 (29.1%) volunteers with risk for falls. Fifty-seven (90.5%) volunteers were considered within the risk parameters in the both versions of the DGI; Six (9.5%) who were at risk in the original version came out of this condition in the brief version and eight (12.6%) who were not at risk in the original version became in this status on the reduced version. The Chi-square test revealed no significant correlation (p = 0.91) between the two versions, which allowed to infer that the reduced version can be used for clinical proposal but revealed a strong correlation on both version (r = 1.0).
The positive correlations verified in the comparison of the tasks on two tools can be explained by evaluating similar functional bases, as well as the tasks that presented negative correlations, since they evaluate different attributes. One example with high correlation it was founded between tasks 3 and 4, in which the patient moves from one point to another with head movement, ranging horizontal to vertical direction. Tasks 4 and 8 were negatively correlated because they were very different activities and needed singular and greater postural control.
Mainly the results pointed that a significant percentage of the volunteers evaluated presented risks for falls, it is possible emphasize that even though they were socially active, they presented a risk for future falls. As the elderly population increases globally become urgent the development of preventive risks to falls strategies  .
The Dynamic Gait Index-Brazil showed a high internal consistency between its tasks and could be a reliable instrument   . There is a correlation between body balance; functional capacity, risk and prevalence for falls in patients with chronic vestibular dysfunction that pointed out a positive correlation with the functional capacity and balance and negative correlation with risk for falls  . A study  noticed that there was influence of the cognitive function on the final scores of the DGI, and it referred no relation between risk for falls and quality of life in socially active elderly  .
Some studies   showed that gait was associated with loss of strength and muscles’ elasticity, postural changes, reduced mobility, poor related self-perception of health, depression, anxiety, prescription of medications, decreased vision, and order issues social and environmental issues.
This brief version agreed with other studies    . Although simple, DGI has a high predictive value for falls risk  . This suggestion of a brief version was disagreed a study  . By its clinical applicability and solid results in based scientific evidence, the results statistically indicate that the use brief instrument is agreement with other studies   that suggested the importance of sensitive, reliable and fast applicability tools for postural control and balance evaluation.
The proposal the balance evaluation with protocols is a simplest way to verify everyone’s ability to control the balance and to identify those who are likely to fall is consonant with the revealed results. The DGI is a reliability and excellent predictive protocol for risk of falls to apply on the elderly  .
The DGI-Brazilian brief version presented an excellent correlation with the original proposal and may be perfectly useful in clinical to point future risks of falls in the elderly people.