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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