The reliability and validity of body Vision system for assessing posture

چکیده مقاله

Introduction: Body vision is a novel method which examines postural indices through photogrammetric essentials. Nevertheless, its reliability and validity has not been appraised till now. We aimed to evaluate the reliability and validity of body vision system for posture assessment. Methods: This was a cross-sectional study in which two examiners evaluated photographs of 71 subjects using body vision system twice with a two-week interval. The body vision system involves a grid wall and a camera fixed in front of the grid wall at about 390 cm distances. Three standing photographs (anterior, right lateral, and posterior view) were captured for participants. Results: The results for inter-rater reliability analysis showed that most of the parameters (74%) had excellent 95% confidence interval (CI), 10 % had good to excellent 95% CI, 13% had moderate to good 95% CI, and 1% had poor to moderate 95% CI. The results for intra-rater reliability analysis showed that 70%-72% of the parameters had excellent 95% CI, 6%-9% had good to excellent 95% CI, 12%-13% had moderate to good 95% CI, and 9% had poor to moderate 95% CI. The comparison between known distances and angles on grid wall and those obtained from photogrammetric measurements showed that there was no statistically significant difference (P > 0.05). Also, the regression analysis showed that there was a significant and positive relationship between them (R2 = 1, P<0.05). Conclusion: The results of this study showed that body vision system is a valid and reliable tool for measuring postural parameters.