Table 2.

Prevalence of lung function deficits

Type of deficit	Exposed group (N = 140)	Unexposed group (N = 140)*
Obstructiona	15 (10.71%)	9 (6.47%)
Restrictionb	83 (59.29%)	18 (12.95%)
Obstruction with restrictionc	7 (5.00%)	2 (1.44%)
Normald	35 (25.00%)	110 (79.14%)

^aFVC normal (≥ 80%), FEV₁ reduced (< 80%), FEV₁/FVC reduced (< 0.7)

^bFVC reduced (< 80%), FEV₁ normal or reduced (≥ 80% OR < 80%), FEV₁/FVC normal or increased (≥ 0.7)

^cFVC reduced (< 80%), FEV₁ reduced (< 80%), FEV₁/FVC reduced (< 0.7)

^dFVC normal (≥ 80%), FEV₁ normal (≥ 80%), FEV₁/FVC normal (≥ 0.7)

^*One value is missing for one participant in the reference group