Fig. 3From: Does waterfall aerosol influence mucosal immunity and chronic stress? A randomized controlled clinical trialIgA levels of the two intervention groups. Antigen-specific salivary IgA levels of responders. Linear mixed model (LMM2) of the waterfall group (WF+) compared to the non-waterfall group (WF−). Significances are indicated by p values. Data are shown in percentage change (±SD) from baseline (pre-serum)Back to article page