Table 1.

Sampling description for the three datasets

Sampling Goal	Events Identified by:	KPNW			KPW
		Base Population	Development Dataset	Validation Dataset	Base Population	Portability Dataset
Suspected overdose cases	Opioid overdose codes	2271	483	848	750	188
	Adverse effects codes	254	78	102	0	0
At risk for overdose	Pain, mental health, substance abuse codes	87 550	222 with ≥30 d supply of ER/LA opioids	373 with ≥30 d supply of ER/LA opioids	33 438	247
			223 with ≤30 d supply of ER/LA opioids	372 with ≤30 d supply of ER/LA opioids		0
Total			1006	1695	34 188	435

Abbreviations: KPNW, Kaiser Permanente Northwest; KPW, Kaiser Permanente Washington.