pft_bdr                 Bronchodilator response per the ERS/ATS 2022
                        criterion
pft_bdr_2005            Bronchodilator response per the Pellegrino 2005
                        standard
pft_change              Conditional change score for serial PFT
                        measurements
pft_classify            Classify ATS spirometry patterns from
                        spirometry and lung-volume measurements
pft_diffusion           Compute carbon monoxide diffusion capacity or
                        transfer factor reference values for given
                        demographics
pft_diffusion_interpret
                        Classify a diffusion result into a clinical
                        pattern category
pft_dlco_hb_correct     Adjust a measured DLCO / TLCO for the patient's
                        hemoglobin
pft_example             Synthetic example PFT cohort
pft_fev1q               FEV1Q: ratio of FEV1 to a sex-specific
                        survivable lower limit
pft_gold                Grade COPD severity by GOLD criteria
pft_interpret           Comprehensive ERS/ATS 2022 PFT interpretation
                        in one call
pft_long                Pivot a 'pft_result' to long form
pft_plot                Clinical visualisation for a single PFT result
pft_prism               Screen for Preserved Ratio Impaired Spirometry
                        (PRISm)
pft_quality             Grade spirometry quality per ATS/ERS 2019
pft_severity            Grade severity of lung function impairment from
                        a z-score
pft_severity_2005       Severity grading per the Pellegrino 2005
                        standard
pft_spirometry          Compute spirometry reference values for given
                        demographics
pft_volume_subpattern   Classify lung-volume sub-pattern per Stanojevic
                        2022 Figure 10
pft_volumes             Compute lung volume reference values for given
                        demographics
