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  • Title: A meta-analysis of zinc salts lozenges and the common cold.
    Author: Jackson JL, Peterson C, Lesho E.
    Journal: Arch Intern Med; 1997 Nov 10; 157(20):2373-6. PubMed ID: 9361579.
    Abstract:
    BACKGROUND: In the United States, the common cold has been estimated to cost more than $3.5 billion a year. Despite several randomized clinical trials, the effect of treating colds with zinc salts lozenges remains uncertain because of conflicting results. OBJECTIVE: To conduct a meta-analysis of published randomized clinical trials on the use of zinc salts lozenges in colds using a random effects model. RESULTS: Eight clinical trials of treating adults with zinc salts lozenges were identified. After excluding 2 studies that used nasal inoculation of rhinovirus, 6 trials were combined and analyzed. The summary odds ratio for the presence of any cold symptoms at 7 days was 0.50 (95% confidence interval, 0.19-1.29). CONCLUSION: Despite numerous randomized trials, the evidence for effectiveness of zinc salts lozenges in reducing the duration of common colds is still lacking.
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