Introduction: The trunk control test is a short, simple measuring tool that assesses trunk control. The ability to control the trunk should be evaluated in patients with a lower mobility rate. Four tasks of the test examine rolling from a supine position on both sides, sitting up from a lying-down position, and sitting in a balanced position. The total score ranges from 0 and up to 100 points, with the higher score indicating better ability. Purpose: The purpose of the graduation thesis was to establish, on the basis of a literature review, the psychometric properties of the trunk control test in different populations of subjects. Methods: The literature was collected until December 2017. The PubMed, CINAHL, and Cochrane Library databases were reviewed. The research articles that were fully published in English language and studied at least one of the psychometric properties of the trunk control test, were included. Results: There were 16 research articles included in the overview. Three of them researched the reliability of trunk control test, sixteen research articles examined validity, and seven its ability to detect changes. Reliability results showed that the trunk control test has fairly to moderate internal consistency (α = 0.749-0.83), excellent intra-rater reliability (ICC = 0.979), and very good inter-rater reliability (rs = 0.76). The validity is, in most cases, moderate to very good (rs = 0.39-0.91). It is possible to predict the ability of walking with different prediction models, containing the trunk control test with high sensitivity (61.5-100%) and specificity (53-100%). Trunk control test can also predict balance, functional independence, mobility outcome, the length of stay, and the discharge outcome. This test has good responsiveness (ROC = 0.92), with a high ceiling effect (up to 100%). Conclusion: The trunk control test has proved to be reliable, valid, and responsive in people with neuromuscular diseases and in stroke patients. In elderly patients, the outcome measures did not comply with the known test psychometric properties. Results of the sensitivity to change are contradictory. Due to the high ceiling effect, the trunk control test is the most appropriate for use in patients with lower functional levels and in bed-bound patients. Further studies to investigate psychometric properties of the trunk control test for different populations, in which this test is used in a clinical setting, are required.
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