Vitamin C Data

Linus Pauling's claims about the efficacy of vitamin C for prevention of the common cold have been tested by various investigators. The following data are from Anderson, Reid, and Beaton Vitamin C and the Common Cold, Canadian Medical Association Journal (1972) 107:503-508. The "No vitamin C" group got a placebo.

"VitC" <-
structure(list(N = c(335, 76, 302, 105),
             VitC = structure(c(1, 1, 2, 2), 
             .Label = c("No", "Yes"), class = "factor"), 
            Cold = structure(c(2, 1, 2, 1), 
             .Label = c("No", "Yes"), class = "factor")), 
            .Names = c("N","VitC", "Cold"), class = "data.frame", 
           row.names = c("1", "2", "3", "4"))