FEV1/FVC Ratio (Tiffeneau Index): Females, Age 20-29
Page updated: Evidence reviewed: What this means
What these numbers mean
A value around 0.866 is typical (50th percentile) for females in this age group. The middle 50% of the reference population fall between about 0.822 and 0.905; values below or above that central range sit in the lower or upper half of the distribution. Position in the distribution does not, on its own, indicate better or worse health for this metric.
Also see: 15-19 · 30-39 · All ages
Data source: Quanjer et al. (GLI-2012) About this study
Reference population: 74,187 healthy lifelong nonsmokers aged 3-95 years in four fitted groups; 57,395 were in the source-labelled Caucasian group
FEV1/FVC Ratio (Tiffeneau Index) Respiratory Females 20-29
FEV1 FVC ratio Tiffeneau Tiffeneau-Pinelli index spirometry obstructive lung disease COPD asthma airflow obstruction pulmonary function norms normative data normative values reference values percentiles benchmarks reference ranges standards FEV1/FVC Ratio (Tiffeneau Index) Percentile Chart
This percentile chart shows how common a value is, not whether it is healthy.