FEV1 percentile calculator for Canadians with cystic fibrosis

Lung function for individuals with CF is usually reported as a percentage of forced expiratory volume in 1s (FEV1) in litres that would be seen in an individual without CF of the same age, sex and height, referred to as FEV1pp. FEV1pp does not indicate how an individual compares to other individuals with CF of the same age, sex and height; that is what this tool does. If you enter your FEV1 in litres, sex, age and height in the spaces below, you will be returned with a percentile. If, for example, you are returned the 97th percentile, that indicates that only 3% of individuals with CF in Canada who are the same sex, age and height have better lung function.
Please enter the person's sex, date of birth, date of the visit, height (in cm) and FEV1 measurement (in L/s) at the visit.
This tool is for individuals 6-49 years of age at the date of visit.

Disclaimer: These percentiles are for individuals with Cystic Fibrosis and are estimates based on the methodology outlined in Kim et al. Reference Percentiles of FEV1 for the Canadian Cystic Fibrosis Population: Comparisons Across Time and Countries. Thorax. These tools do not give professional advice; healthcare professionals who use this tool should exercise their own clinical judgement when interpreting the information the tool provides. Non-medical professionals who are using this tool, do so at their own risk. For medical concerns including decisions about medications and other treatments, non-medical users should always consult their physician.