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