Table 4.

Estimates for NNT From the Included Trials^a

Day	Proportion of Patients Still Sick on the Given Day			NNT
	Zinc	Placebo	Difference
2	0.902	0.969	0.067	15
3	0.677	0.938	0.262	3.8
4	0.471	0.835	0.365	2.7
5	0.304	0.732	0.428	2.3
6	0.186	0.608	0.422	2.4
7	0.108	0.392	0.284	3.5
8	0.049	0.247	0.198	5.0

Abbreviations: NNT, the average number of common cold patients needed to be treated for 1 patient to become cured by the given day.

^aThese calculations are based on the Kaplan-Meier estimates shown in Figure 1A.