Version May 29, 2012
Study group | Prophylactic vit C dose |
Therapeutic vit C dose |
All subjects | All subjects | "Blinded" subjects |
"Blinded" subjects |
"Unblinded" subjects |
"Unblinded" subjects |
(g/day) | (g/day) | Duration of colds (days) |
No. of colds |
Duration of colds (days) |
No. of colds |
Duration of colds (days) |
No. of colds |
|
#0 | 0 | 0 | 7.1 | 65 | 6.3 | 30 | 8.6 | 16 |
#1 | 0 | 3 | 6.5 | 56 | 6.7 | 18 | 4.7 | 15 |
#2 | 3 | 0 | 6.7 | 52 | 6.4 | 14 | 7.0 | 8 |
#3 | 3 | 3 | 5.9 | 76 | 6.5 | 30 | 4.8 | 13 |
Trial 2) | Total no. cold episodes in the trial |
Total citations from 1991 to 2002 |
Excluding citations by Hemilä |
Constituent of the placebo |
Karlowski 1975 | 249 | 43 | 33 | Lactose |
Anderson 1972 | 1,170 | 12 | 4 | Citric acid 3) |
Anderson 1974 4) | 2,182 | 9 | 4 | Lactose and citric acid 3) |
Pitt 1979 | 1,219 | 12 | 3 | Citric acid 3) |
Ludvigsson 1977b | 1,279 | 11 | 2 | not stated 3) |
Elwood 1976 | 1,317 | 9 | 1 | not stated 3) |
Total episodes excluding Karlowski |
7,167 | Total citations excluding Karlowski |
14 |