Table 4.

s-IgA levels in saliva samples before and after the study period in the K15 and placebo groups.

	K15 (n = 20)	Placebo (n = 18)	p
Before	34.6 ± 32.1	24.9 ± 16.2	0.2448
After	33.3 ± 16.4	31.8 ± 13.5	0.7713
Change rate (after/before)	1.46 ± 1.02	1.75 ± 1.44	0.4734

Data are presented as µg/mL (mean ± SD). s-IgA, secretory immunoglobulin A.