Table 2.

Accuracy of hospital-based sources with respect to total OHCA cases in the NALHN OHCA registry expected to be identified by each source, 2011–16.

	Total yield (n)	True positive (n)	Total OHCA (n)	Sensitivity (%)	PPV (%)
Emergency Department coding dataset	390	305	357 admitted to Emergency Department	85.4	78.2
Cardiac catheterisation registries	197	145	163 underwent cardiac catheterisation	88.96	73.6
Intensive Care Unit registry	250	228	253 admitted to Intensive Care Unit	90.1	91.2
ICD-10 coding dataset	760	251	316 admitted as in-patient	79.4	33.0

ED, Emergency Department; ICU, Intensive Care Unit. Sensitivity = true positive/total OHCA; PPV, Positive Predictive Value = true positive/total yield. Refer Fig. 2 for search criteria used to generate each source.