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Number and length of colds in study participants

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Reference no: EM132846583

A study from the 1970's examined the effects on ascorbic acid (Vitamin C) on the number and length of colds in study participants. There was a break in the double blind which invalidated the study. What happened?

-The investigators cheated-they knew who received ascorbic acid or placebo

-The participants could read which they received-the placebo or ascorbic acid through the thin paper of an envelope

-The randomization process was flawed

-The participants bit into the tablets and therefore know which treatments they received-the placebo or ascorbic acid

Reference no: EM132846583

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