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Table 1 Socio-demographic characteristics of respondents

From: Air quality index from charcoal production sites, carboxyheamoglobin and lung function among occupationally exposed charcoal workers in South Western Nigeria

Socio-demographic characteristics

Subgroups

Percentage

Subjects

Controls

Mean age of subjects

32.67 ± 10.47

Mean age of controls

35.46 ± 12.82

≤20

10.5

7.0

21–30

43.9

35.1

31–40

31.6

38.6

41–50

7.0

5.3

>50

7.0

14.0

Gender

Male

73.7

71.9

Female

26.3

28.1

Educational status

No education

35.1

17.5

Primary education

31.6

21.1

Secondary education

31.5

24.6

Tertiary education

1.8

36.8

Marital status

Married

73.7

56.1

Single

26.3

43.9

Religion

Christianity

86.0

63.2

Islam

14.0

36.8

Tribe

Yoruba

12.3

66.7

Tiv

64.9

21.1

Hausa

–

12.2

Others

22.8

–