Table 2.

Distribution of visits, people, and events using visit-level and person-level splits for training and test sets

	All development data	Visit-level split†		Person-level split
		Training	Testing	Training	Testing
Number of visits	1,518,968	987,329	531,639	987,038	531,930
Number of visits with event	10,171	6,614	3,557	6,638	3,533
Event rate (per 1,000 visits)	6.7	6.7	6.7	6.7	6.6
Number of people	207,915	180,508	141,968	135,144	72,771
Number of people with any event‡	1,949	1,669	1,271	1,278	671
Event rate (per 1,000 people) §	9.4	9.2	9.0	9.5	9.2
Number of unique events §§	2,444	2,061	1,517	1,603	841
Number of unique events occurring in both training and testing sets	n/a	1134 (46%)		0 (0%)

^†For the visit-level training/testing split, the sum of the number of people, people with any event, and unique events across the training and test sets will be greater than the number of people, people with any event, and unique events in the combined dataset because visits from the same person (or associated with the same event) may appear in both training and test sets.

^‡Number of people with one or more visits with a suicide attempt within 90 days.

^§Event rate is calculated as the proportion of people with any 90-day suicide attempt x 1,000.

^§§Number of unique events may include multiple events per person if separate suicide attempts occurred in the 90-days following a visit in the development dataset.