PARAMETERS

MEAN ± SD

STATISTICAL TEST

Gasoline pump Attendant

(n = 140)

Control group

(n = 140)

PEFR (Litres/mins)

496 ± 24.12

543 ± 18.60

t = 18.21

p = 0.001*

FEV1 (Litres)

2.76 ± 0.68

3.04 ± 0.88

t = 2.98

p = 0.003*

FVC (Litres)

3.09 ± 0.71

3.39 ± 0.93

t = 3.03

p = 0.003*

FEV1/FVC (%)

86.18 ± 15.81

90.89 ± 21.16

t = 2.11

p = 0.036*

FEF_{25% - 75%}L/Sec

3.01 ± 0.73

4.28 ± 0.84

t = 13.5

p = <0.001*