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Table 3 Estimated parameters, goodness-of-fit statistics and estimated dose reduction for GQscore

From: Regression models for analyzing radiological visual grading studies – an empirical comparison

Model Coefficient Goodness-of-fit Dose Reduction
logCTDI id2 id4 AIC Pseudo R2 id2 id4
  Est. P-value Est. P-value Est. P-value
regressa 1.424 <0.001 0.158 <0.001 0.175 <0.001 - 0.3560 10.53 % 11.57 %
(1.217, 1.630) (0.085, 0.232) (0.102, 0.248) (6.46 %, 14.59 %) (7.58 %, 15.56 %)
ologita 9.626 <0.001 1.011 <0.001 1.133 <0.001 1060.25 0.3573 9.97 % 11.10 %
(8.020, 11.232) (0.547, 1.476) (0.665, 1.600) (6.13 %, 13.17 %) (7.32 %, 14.88 %)
gologit2a 8.627 <0.001 1.092 <0.001 1.484 <0.001 1113.99 0.3816 11.89 % 15.80 %
=2 (6.519, 10.735) (0.558, 1.625) (0.924, 2.044) (6.74 %, 17.03 %) (10.48 %, 21.12 %)
gologit2a =3 9.652 <0.001 0.964 0.073 0.387 0.507 9.50 % 3.93 %
(6.915, 12.388) (−0.091, 2.019) (−0.756, 1.529) (1.29 %, 17.72 %) (−6.76 %, 14.61 %)
slogita 18.523 <0.001 1.867 <0.001 2.148 <0.001 1061.13 0.3594 9.59 % 10.95 %
(15.277,21.769) (0.997, 2.738) (1.275, 3.022) (5.80 %, 13.38 %) (7.23 %, 14.67 %)
mixedb 1.424 <0.001 0.158 <0.001 0.175 <0.001 1119.97 0.1857 10.53 % 11.57 %
(1.218, 1.630) (0.085, 0.231) (0.102, 0.248) (6.47 %, 14.59 %) (7.58 %, 15.55 %)
meologitb 9.179 <0.001 0.967 <0.001 1.085 <0.001 1123.66 0.1853 10.00 % 11.15 %
(7.031, 11.328) (0.468, 1.467) (0.578, 1.592) (6.03 %, 13.98 %) (7.25 %, 15.05 %)
  1. 95 % confidence limits of each estimate given in parentheses
  2. aregression model with fixed effects only
  3. bregression model with fixed and random effects