Bernabeu–Mora R, et al. – The motivation behind this study was to identify health–related, functional, and psychological determinants of each Short Physical Performance Battery (SPPB) test. The results of this study revealed that the three SPPB tests did not provide equivalent information regarding a COPD patient’s status. The five-repetition sit-to-stand test (5STS) was correlated with health status factors. On the other hand, the 4 m gait speed test (4MGS) was related to psychological factors.