Table 4. Simple regression between pulmonary function test parameters and job title.

Parameter	Coefficient	p‑value	95% CI
FEV1 (L)	–0.495	<0.001*	–0.247
FVC (L)	–0.445	<0.001*	–0.466 - –0.19
FEV1/FVC (%)	–0.235	0.024*	–0.037
PEFR (L/min)	–0.441	<0.001*	–35.78

CI = confidence interval

FEV₁ = forced expiratory volume in 1 second

FVC = forced vital capacity

PEFR = peak expiratory flow rate

* Significant (p<0.05)