Clinimetric properties of the Turkish version of the De-Morton Mobility Index (DEMMI) in intensive care unit survivors - a cross-sectional observational study

Purpose To investigate the intra-rater reliability and the construct validity of the Turkish version of the De-Morton Mobility Index (DEMMI) in intensive care unit (ICU) survivors. Methods Construct validity of the DEMMI was measured by correlating it with physical functioning scales. Known group comparison was made according to the Medical Research Council Sum Score (MRC-SS). Internal consistency was determined by measuring Cronbach alpha coefficient. Test-retest reliability was assessed by performing the DEMMI by the same researcher after 24 h and calculating the intraclass correlation coefficient (ICC). The minimal detectable change (MDC) value was calculated. Results One hundred and two patients discharged from the ICU were included. The ICC for intra-reliability was 0.972. The internal consistency was excellent (Cronbach = 0.991). The DEMMI total score was correlated with the Barthel Index (r = 0.791), Katz Index of Independence in Activities of Daily Living (r = 0.722), MRC-SS (0.614), ICU length of stay (r = -0.515), and total mechanical ventilation duration (r = -0.488). The DEMMI was able to differentiate between MRC-SS subgroups (p < 0.001), whereby higher strength was associated with higher DEMMI scores. The MDC was determined to be 6.82 out of 100 points. Conclusion The Turkish version of the DEMMI is reliable and valid for measuring mobility in ICU survivors.

Automated summary

The purpose of this study was to investigate the reliability and validity of the Turkish version of the De-Morton Mobility Index (DEMMI) in ICU survivors. The results showed that the Turkish version of DEMMI had excellent internal consistency and construct validity, and it can be used to measure the mobility of ICU survivors.