Appendix 2.

Summary Measures of Model Fit for Random Forest Models

Metric	TMD	Headache	IBS	LBP	Fibromyalgia
Observed % of cases	0.278	0.412	0.241	0.212	0.079
Area under precision-recall curve	0.556	0.491	0.267	0.306	0.221
Area under receiver operator characteristic curve	0.774	0.591	0.548	0.617	0.765
Brier score	0.178	0.240	0.220	0.202	0.141
Mutual information index	0.069	0.008	0.000	0.010	0.020
Proportion of variance explained	0.154	0.049	0.047	0.051	0.151
Maximum variable importance factor: Predicting cases	0.198	0.059	0.035	0.051	0.138
Maximum variable importance factor: Predicting controls	0.012	0.010	0.008	0.018	0.008
Maximum variable importance factor: All	0.009	0.009	0.002	0.004	0.003