Study characteristics of the 34 randomized controlled trials evaluating the effects of mind-body therapies on the immune system.

CD4 = cluster of differentiation 4 protein; CRP = c-reactive protein; IL-6 = interleukin 6; IL-8 = interleukin 8; INF-gamma = Interferon gamma; Med = meditation; NK count = natural killer cell count; QG = Qi Gong; TC = Tai Chi; TNF-α = Tumor necrosis factor.min = minutes; hr = hour; hrs = hours.*In studies that involved more than one active intervention, we restricted our analyses to the comparisons between mind-body therapy intervention and control group. Therefore, number analyzed reflects the total number of participants analyzed in the mind-body therapy intervention and control group only.