Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Scatter plot and linear mean regression line with 95% confidence interval (A) overall and (B) by age group. Correlations between the assays were analyzed using Pearson correlation coefficient (P < 0.001). (C) Correlation between the assays according to Bland–Altman plot using standardized data.
