Table 2. Natural killer cell activity, cytokine, and IgG concentrations between β-glucan and placebo groups¹⁾.

¹⁾ Values are means ± SDs.

²⁾ P-values for differences of changes from baseline between the β-glucan and placebo groups at week 8 were determined by the independent t-test.

³⁾ P-values for difference of changes from baseline between the β-glucan and placebo groups at week 8 were determined by the ANCOVA after adjusting for smoking and stress status.

NK cell activity, natural killer cell activity; IFN-γ, interferon-γ; IL-2, interleukin-2; IL-4, interleukin-4; IL-6, interleukin-6; IL-10, interleukin-10; IL-12, interleukin-12; TNF-α, tumor necrosis factor-α; IgG, immunoglobulin G.