When teaching Holly, age 14, to use a peak expiratory flow meter, which "zone" indicates her expiratory compliance is 50% to 80% of her personal best?

The yellow zone on a peak expiratory flow meter indicates that the individual's expiratory flow is between 50% and 80% of their personal best. This zone serves as an important alert that the person may be experiencing worsening asthma control or other respiratory issues. It indicates that they should take caution and possibly adjust their medication or seek medical advice, as it suggests that their airflow is not at optimal levels.

In the context of asthma management, the yellow zone is significant because it prompts individuals to monitor their symptoms closely and take necessary steps to prevent exacerbations. This proactive approach can help in maintaining better overall respiratory health and preventing serious complications.