
Urban firefighters are routinely exposed to both physical and chemical hazards that can negatively impact lung health, but it is unclear if firefighters experience accelerated decline in spirometry parameters due to chronic exposure and acute insults. This study aimed to describe sub‐groups of firefighters with differing spirometry trajectories and examine the relationship between the identified trajectories and demographic, lifestyle and occupational characteristics. In the 669 included firefighters, we identified five trajectories for the combination of Forced Expiratory Volume in the first second z‐score (FEV1z), Forced Vital Capacity z‐score (FVCz) and the ratio of FEV1 and FVC z‐score (FEV1/FVCz). GBMTM defined distinct, plausible spirometry trajectory sub‐groups. Firefighter longitudinal spirometry trajectory group membership was associated with BMI and respiratory disease or symptoms but not with self‐reported smoking history or occupational factors.
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