Symptom

Cassava processors

n = 264

Petty traders

n = 264

χ²

df

P value

Cough

60(22.7)

25(9.5)

17.18

1

<0.001*

Phlegm

61(23.1)

29(11)

13.72

1

<0.001*

Wheezing in the last one year

27(10.2)

14(5.3)

4.47

1

0.05*

Parameter

Cassava processors (Mean ± SD) n = 258

Petty traders (Mean ± SD) n = 249

t

P-value

FVC (liters)

2.11 ± 0.37

2.19 ± 0.28

2.772

0.007*

FEV1(liters)

1.58 ± 0.38

1.72 ± 0.26

4.557

<0.001*

FEV1/FVC%

74.12 ± 7.55

78.34 ± 5.05

7.375

<0.001*

FVC-% of predicted (%)^**

87.66 ± 11.05

90.41 ± 11.11

2.792

0.005*

FEV1-% of predicted (%)^**

83.34 ± 16.61

90.31 ± 11.11

5.154

<0.001*

FEV1/FVC%-% percentage of predicted (%)^**

94.48 ± 9.87

100.43 ± 8.80

7.154

<0.001*