Parameters of the final regression model.

%SEE = percent standard error of parameter estimate,
*95% confidence interval of the parameter obtained as the 2.5th and 97.5th percentiles of the results of 1000 model runs using Bootstrap resampling with NONMEM.
AU: Arbitrary unit used for the above-mentioned numerical re-definition of the cues.
#: Not estimated because the parameter was not part of the final model as it had not provided a significant improvement of fit during the model building (fitting) process.
Specifically, the percentages of stimuli at pain threshold level rated as painful were associated with the three different cues using a linear model of

PercentRatedAsPain=Slope⋅
θ1
2−Group

⋅θ2
Sex

⋅Cue+Y_Intersection⋅θ3
2−Group

⋅θ4
Sex

, where Cue = [–1,0,1] for “no pain”, “stimulus or neutral cue, and “pain”, respectively; Group = [1,2]; and Sex = [0,1] for women and men, respectively. The fits are plotted in Fig 2. The final model was the result of goodness-of-fit statistics. Only parameters that provided a statistically significant improvement when free to be estimated remained part of the final model, which therefore, in its short form reads as

PercentRatedAsPain=39.5
%
AU

⋅(
−

0.526
2−Group

)
⋅Cue+24.1%

.