Spirometry. FEV<sub>1</sub>, FVC and FEV<sub>1</sub>/FVC among demolition workers, insulators, carpenters and hospital porters. Adjusted odds ratios* (OR) with 95% confidence interval (CI).

Table 4: Spirometry. FEV₁, FVC and FEV₁/FVC among demolition workers, insulators, carpenters and hospital porters. Adjusted odds ratios* (OR) with 95% confidence interval (CI).

	Demolition workers		Insulators		Carpenters		Hospital porters		Total
	N = 141		N = 149		N = 296		N = 313		N = 899
	n (%)	OR [95% CI]	n (%)	OR [95% CI]	n (%)	OR [95% CI]	n (%)	OR	n (%)
FEV₁/FVC < 0.7	29 (21)	1.1 [0.6-1.9]	27 (18)	0.9 [0.5-1.5]	37 (13)	0.8 [0.5-1.3]	55 (18)	1	148 (17)
FEV₁ < LLN	24 (17)	1.3 [0.7-2.3]	16 (11)	0.8 [0.4-1.6]	14 (5)	0.5 [0.2-0.9]	37 (12)	1	91 (10)
FVC < LLN	9 (6)	1.1 [0.5-2.6]	7 (5)	0.7 [0.3-1.6]	2 (1)	0.1 [0.0-0.6]	21 (7)	1	39 (4)

*OR is adjusted for smoking status, age group and BMI