Table 4.

Meaningful use (MU) definitions in US studies (n=76).

Measure	Definition	Studies with requisite measure, n (%)a	Study citations
Explicit MU motive	Authors state outright that the motivation behind the study stemmed from MU criteria	18 (24)	[7,18,30,32,37,42,45,55-65]
Mention of MU	Some mention of MU was made in the introduction or discussion	40 (53)	[6,8-10,33,36,38-40,43,44,47,50,53,54,66-90]
Access	Patient login into the portal	45 (59)	[6,9,18,30,32,33,36-38,40,42-45,50,51,53-56,58,60-66,69,71,72,80-82,85,87-96]
Send	Sending a secure message to the health care provider	45 (59)	[8-10,18,30,32,35,39,40,42-44,50,51,54-60,62,63,65-67,70-73,75-78,85-88,91,94-99]
View-download-transmit (VDT)	Ability to view, download, and transmit health information within 4 days of an office visit (providers) or 36 hours of discharge (hospital)	9 (12)	[36,42,56,60,61,65,72,81,96]
MU-2	Met requirements for access, send, and VDT	6 (8)	[42,56,60,65,72,96]

^aPercentages exceed 100% total because studies could meet more than one criterion, and MU-2 represents studies that met all three conditions (access, send, and VDT) that together entail the full requirements of Centers for Medicare & Medicaid Services MU stage 2.