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. Author manuscript; available in PMC: 2017 Jul 15.
Published in final edited form as: Spine (Phila Pa 1976). 2016 Jul 15;41(14):1153–1159. doi: 10.1097/BRS.0000000000001518

Figure 2. Linear regression analysis.

Figure 2

Linear regression plots are shown illustrating the correlation of NDI with PROMIS physical function CAT for all patient visits (A). A significant correlation between NDI and PROMIS was found with a combined correlation value of 0.8482 (p<0.001). Residual plot demonstrate the appropriate use of a linear fit for the regression analysis, with a random and equal distribution about the predicted line (B).