Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

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.

View full-text article in PMC

. 2023 May 9;11:990510. doi: 10.3389/fped.2023.990510

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2023 Wu, Zhang, Wang, Han, Shi, Zhang, Shen, Jiang, Jia, Yu, Long, Ji, Liu, Pan, Ma, Wu and Dai.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

Fnno values in children by age. (A) FnNO values increased with age in children aged 6–11 yrs; (B) FnNO values decreased with age in children aged 12–18 yrs.