Results: Children in the Lactobacillus group had fewer days of absence from daycare because of illness (4.9 days [95% CI, 4.4–5.5] versus 5.8 days [95% CI, 5.3–6.4]; absolute difference, 16% [P = 0.03]). Corresponding age-adjusted findings were 5.1 days (95% CI, 4.6– 5.6) for the Lactobacillus group versus 5.7 days (95% CI, 5.2–6.3) for the control group; age-adjusted difference, 11% (P = 0.09)...