Main Article Content
The purpose in this study is to assess intra-rater and inter-rater reliability of 3 methods for measuring spinal curvature in 30 anteroposterior radiograph 2D view (AP view) with spinal patients of Lerdsin hospital during the year from 2004 to 2011. Three methods i.e. Cobb, Ferguson and Polynomial are compared with each value in terms of reliability. Ferguson is the traditional method and Cobb is probably the most popular, while polynomial is one of the first documented mathematical models for sagittal spinal curvature. Intraclass correlation coefficient (ICC) is used to calculate the inter-rater reliability (ICC model 2, 1) and intra-rater reliability (ICC model 3, 1). The statistical analysis shows that the intra-rater reliabilities of Ferguson, Cobb and Polynomial are 0.968, 0.950 and 0.910, respectively. In similarity, their inter-rater reliabilities are 0.477, 0.659 and 0.407 respectively. The results indicate that the most reliable measurement of spinal curvature is the Ferguson method. It can be used to assess the measurement with some cautions especially. And the most reliable measurement of spinal curvature is Cobb method, when using between examiners.
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