Table 5

Regression of FVC, FEV₁, and FEV₁/FVC% on selected explanatory factors based on most recent spirometry test for 371 employees

Explanatory factor			FVC				FEV₁			FEV₁/FVC
Parameter	Mean		β	SEM			β	SEM		β	SEM
Occupational factors:
TDI dose (ppb-months)^5-151	234.2^5-152	0.00009	0.00013		0.00013	0.00011		0.00001	0.000014
Acute exposure to phosgene (%)	11.3	−0.257^5-160	0.0938		−0.241^5-160	0.0809		—	—
Occupational asthma (%)	4.6	—	—		—	—		−0.042^5-160	0.0157
Non-occupational factors:
Age (y)	44.8	−0.029^5-165	0.0031		−0.030^5-165	0.0027		−0.002^5-165	0.0003
Height (cm)	177.1	0.054^5-165	0.0044		0.040^5-165	0.0038		−0.001^5-150	0.0005
Race (% black)	28.6	−0.681^5-165	0.0650		−0.485^5-165	0.0560		—	—
Sex (% women)	6.7	−0.451^5-165	0.1271		−0.364^5-165	0.1097		—	—
Cigarettes (pack-years)	14.3	−0.004^5-150	0.0017		−0.006^5-165	0.0014		−0.001^5-165	0.0002
History of non-occupational asthma (%)	6.2	—	—		−0.260^5-150	0.1046		−0.063^5-165	0.0136

↵5-150 p<0.05;
↵5-160 p<0.01;
↵5-165 p<0.001.
↵5-151 TDI dose forced into model, other factors included based on backward selection with p<0.05.
↵5-152 Mean dose in 267 TDI unit employees.