Furthermore, although the pooled RRs did not reach statistical significance, a trend towards a higher incidence of headache was observed in the QS-21-adjuvanted vaccine group (pooled RR 1.66, 95% CI 0.93–2.97, p = 0.09).
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Meta-Analysis on Randomized Controlled Trials of Vaccines with QS-21 or ISCOMATRIX Adjuvant: Safety and Tolerability.
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The sentences
Furthermore, the results showed a trend towards an increased risk for injection site redness/erythema in patients receiving saponin-adjuvanted vaccine compared to those receiving placebo, although it was not statistically significant (pooled RR 1.44, 95% CI 0.95–2.17, p = 0.08).