8e9f9fba_nagement_Purchasing_Consortium__Comments_Qualifications
[Vendor] Linkwell (www.linkwellhealth.com) Control and study groups are matched in motivation as well as by measurable variables. To match for motivation, one can sign up volunteers and deny a portion the intervention (as in drug studies), or -- as with Linkwell -- compare two groups that are matched where the study group is dummied without or before asking if they want to participate. All members of both groups are then compared -- in Linkwell's case also in numbers far larger and therefore more significant than any other wellness program. Therefore the claimed result is unimpeachably valid by the standards of this industry, perhaps the most statistically significant "moving the needle" in all of wellness. [Comments/Qualifications] 
No study design asterisks are necessary. One might quarrel with Linkwell's definitions of "healthy" and "unhealthy" but those definitions are clearly specified so that there is no intentionally or inadvertent misrepresentation. (Part of valid study design is acknowledging limitations.)
The DMPC Gold Standard: The Exhaustive Listing of Vendors/Carriers/Consultants Measuring Validly | Disease Management Purchasing Consortium
Comments/Qualifications