Table 3 Distribution of lung function in quarry workers

Forced Expiratory Volume at first second FEV1 (liters)

2.13 \(\:\pm\:\:\) 0.50

Forced Vital Capacity FVC (liters)

2.50 \(\:\pm\:\) 0.77

FEV1/FVC ratio (%) (FEV1/FVC * 100)

85.20 \(\:\pm\:\) 7.73

FEV1 (predicted %)

84.86 \(\:\pm\:\) 12.00

FVC (predicted %)

87.39 \(\:\pm\:\) 12.63

Frequency (n = 300)

Percentage (%)

FEV1 (predicted %)

Normal \(\:(\ge\:\) 80%)

214

71.3

Abnormal (< 80%)

86

28.7

FVC (predicted %)

Normal \(\:(\ge\:\) 80%)

237

79.0

Abnormal (< 80%)

63

21.0

FEV1 / FVC%

Normal \(\:(\ge\:\) 80%)

248

82.7

Abnormal (< 80%)

52

17.3

Chronic Obstructive Pulmonary Disorder (COPD)

Present

32

10.7

Absent

268

89.3

Restrictive Disorder

Present

43

14.3

Absent

257

85.7