Letter to the Editor: Effectiveness of the Varicella Vaccine in Korea: Unresolved Issues.

J Korean Med Sci · 2021 · PMC8275458 · PMID 34254478

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a decreasing trendno p-value reported

1 ) also shows an age-shift phenomenon with a decreasing trend in the annual total number of varicella cases in Korea.

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an increasing trendno p-value reported

On the other hand, the authors 1 said in their response that “...it is identified in common for both data that the age peak in the incidence rate has shifted from 4 or 5 to 6 years old, although the incidence rate of varicella with the National Health Insurance Service (NHIS) data decreased contrary to an increasing trend with the National Notifiable Disease Surveillance System (NNDSS) data.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.