Table 1.

Characteristics of the 6 studies in this review that examined the use of medical marijuana for CNCP

STUDYCOUNTRYFUNDING SOURCESTUDY DESIGNQUALITY ASSESSMENT*
Abrams et al,15 2007USCenter for Medicinal
Cannabis Research		Randomized, double-blind trial3 (High)
Corey-Bloom et al,11 2012USCenter for Medicinal
Cannabis Research		Randomized, double-blind, placebo-controlled, crossover trial2 (Low)
Ellis et al,13 2009USCenter for Medicinal
Cannabis Research		Randomized, double-blind, placebo-controlled, crossover trial3 (High)
Ware et al,12 2010CanadaCanadian Institutes of Health ResearchRandomized, double-blind, placebo-controlled, crossover trial3 (High)
Wilsey et al,9 2013USNational Institutes of HealthRandomized, double-blind, placebo-controlled, crossover trial3 (High)
Wilsey et al,14 2008USCenter for Medicinal
Cannabis Research		Randomized, double-blind, placebo-controlled, crossover trial3 (High)

  • CNCP—chronic noncancer pain, US—United States.

  • ↵* Based on the Jadad scale.8