Table 3.

Performance of 3 Models Varying in Complexity on the Test Data (n = 34 722)^*

Model	Dimensionality	AUC RP > 24 (95% CI)	AUC RP > 48 (95% CI)
EMR	1017	0.8129 (.79–.83)	0.7886 (.76–.82)
Curated	14	0.7163 (.69–.75)	0.6900 (.66–.72)
EMRall	10 859	0.8140 (.80–.83)	0.7896 (.76–.81)

Abbreviations: AUC, receiver operating characteristic curve; CI, confidence interval; EMR, electronic medical record; RP, risk period.

* We measure performance in terms of AUC of predictions applied to all of the patients present in the hospital 24 h after admission (who have not yet tested positive for Clostridium difficile) and also a subset of patients with an RP >48 h.