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The purpose of this study was to determine the reliability and validity of the TIS in assessing children with spastic diplegic cerebral palsy. The sample was a total of 30 subjects (15\u2009=\u2009boys, 15\u2009=\u2009girls). All subjects underwent an assessment of the sitting component of the Gross Motor Function Measure-88 and TIS by rater 1. Rater one observed video recordings within 24\u00a0h and scored TIS for intra-rater reliability, while rater two did likewise after 48\u00a0h for inter-rater reliability. The mean and standard deviation of the TIS and sitting components of the Gross Motor Function Measure-88 were 15.66\u2009\u00b1\u20094.20 and 52.36\u2009\u00b1\u20096.26, respectively. We established intra-rater and inter-rater reliability of the TIS with Intra Class Correlation Coefficient 0.991 and 0.972, respectively. The concurrent validity of the TIS with the sitting component of the Gross Motor Function Measure-88 was good, with an r-value of 0.844 (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). This study showed the excellent intra-rater and inter-rater reliability and high concurrent validity of the TIS in assessing children with spastic diplegic cerebral palsy.<\/jats:p>","DOI":"10.1038\/s41598-021-98104-7","type":"journal-article","created":{"date-parts":[[2021,9,17]],"date-time":"2021-09-17T10:04:13Z","timestamp":1631873053000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Psychometric properties of trunk impairment scale in children with spastic diplegia"],"prefix":"10.1038","volume":"11","author":[{"given":"Vedasri","family":"Dasoju","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rakesh Krishna","family":"Kovela","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaya Shanker","family":"Tedla","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Devika Rani","family":"Sangadala","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ravi Shankar","family":"Reddy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,9,17]]},"reference":[{"issue":"02","key":"98104_CR1","doi-asserted-by":"publisher","first-page":"61","DOI":"10.4236\/nm.2011.22009","volume":"02","author":"S Karthikbabu","year":"2011","unstructured":"Karthikbabu, S. et al. 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