Exhaled nitric oxide in contrasting population samples of Finnish and Russian Karelia: Table 1—

Exhaled NO is a poor marker of asthma control in children with a reported use of asthma medication: a pharmacy‐based study

“…A study by Malmberg et al. (30) found a trend between growing up in the countryside and lower FeNO levels in Finnish and Russian populations, but the countryside in those countries might be incomparable to the countryside in the densely populated Netherlands. It is unlikely that ambient NO has contaminated our results because it was removed during the FeNO measurement through the use of a NO filter (31).…”