Table 3. Primary and secondary outcomes.

	Active Least squares mean (s.e.)	Control Least squares mean (s.e.)	P-value
Primary outcomes
Incidence rate of CID per 100 person daya	7.8 (0.4)	9.8 (0.7)	0.046
Rate of days with change in activity because of illness per 100 person dayb	2.30 (0.21)	2.27 (0.21)	0.91
Secondary outcomes
Incidence rate of GITI per 100 person daya	1.2 (0.10)	1.6 (0.15)	0.042
Incidence rate of URTI per 100 person daya	2.7 (0.18)	3.3 (0.20)	0.036
Incidence rate of LRTI per 100 person daya	2.7 (0.16)	2.8 (0.18)	0.829
Rate of vomiting per 100 person day	0.55 (0.08)	0.73 (0.08)	0.10
Rate of stomach pain per 100 person day	1.23 (0.21)	1.50 (0.21)	0.36
Rate of constipation per 100 person day	0.81 (0.18)	0.71 (0.18)	0.68
Rate of runny nose per 100 person day	7.88 (0.63)	8.65 (0.63)	0.39
Rate of cough per 100 person day	9.18 (0.63)	8.37 (0.63)	0.36
Rate of decreasing appetite per 100 person day	2.58 (0.31)	2.31 (0.31)	0.54
Rate of fever per 100 person day	1.34 (0.14)	1.34 (0.14)	0.99
Rate of rash per 100 person day	1.17 (0.23)	0.76 (0.23)	0.21

Abbreviations: CID, common infectious disease; GITI, gastrointestinal tract infections; LRTI, lower respiratory tract infections; URTI, upper respiratory tract infections.

^aIncidence rate per 100 person day=incidence rate per day × 100.

^bRate of days with change in activity because of illness=number of days with change in activity/number of days in the study.