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Table 3 Linear, Multiple Linear and Non-linear Correlation Models of CTFCindex and Topographical Parameters

From: Correlation of increased corrected TIMI frame counts and the topographical extent of isolated coronary artery ectasia

Model Dependent Variable Independent Variables Equation Ra2 AIC RSD
Linear model  
 1 CTFC index Dindex CTFCindex = −9.042 + 7.619* Dindex 0.353 392.9 12.6
 2 CTFC index ERindex CTFCindex = −16.246 +  30.404* ERindex 0.410 385.7 12.0
 3 CTFC index LDindex CTFCindex = 16.360 + 0.444* Lindex 0.242 405.0 13.6
 4 CTFC index EEAindex CTFC = 17.407 + 0.065EEAindex 0.444 381.1 11.6
Multiple linear model  
 1 CTFC index ERindex
LDindex
CTFC = −18.970 + 24.842ERindex + 0.245LDindex 0.466 379.0 11.3
 2 CTFC index Dindex
LDindex
CTFC = −14.396 + 0.285LDindex + 6.091Dindex 0.436 393.3 11.7
 3 CTFC index Dindex ERindex
LDindex EEAindex
CTFC = 17.248-3.935Dindex + 19.005ERindex-0.354LDindex + 0.092EEAindex 0.481 378.7 11.0
Nonlinear model  
 1 CTFC index EEA index CTFC = 34.305-0.035EEA index  + 1.22−4EEA index ^2 0.526 367.8 10.7
 2 CTFC index EEA index CTFC = 18.208 + 0.122EEA index -2.94−4EEA index ^2+  3.13−7EEA^3 0.546 363.5 10.4
  1. Ra2 Adjusted R square, AIC Akaike information criterion, RSD Residual standard deviation