From this analysis, 251 children (4.4%) had 'no BCG scar' with an increasing trend by age.
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The sentences
In children less than 12 months old, the median of pin number was 18 (IQR, 15~18), while the median of pin number in 6 years old was 16 (IQR, 11~18), showing a decreasing trend of pin scars over time.