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Table 1 Socio-demographics of participants

From: Respiratory symptoms and illnesses related to the concentration of airborne particulate matter among brick kiln workers in Kathmandu valley, Nepal

Socio-economic variables Response groups
Exposed Referent
Frequency % Frequency %
Age group of the respondents
 ≤ 19 years 81 20.2 12 3.0
 20–29 years 119 29.8 129 32.2
 30–39 years 84 21.0 166 41.5
 40–49 years 68 17.0 72 18.0
 50–59 years 33 8.2 16 4.0
 60–69 years 11 2.8 5 1.2
 ≥ 70 years 4 1.0 0 0
Total 400 100.0 400 100.0
Exposed: mean age = 31.74 years, SD of age = 12.97 years, range of age = 12 to 73 years
Control: mean age = 33.33 years, SD of age = 9.03 years, range of age = 14 to 68 years
Gender
 Female 102 25.5 130 32.5
 Male 298 74.5 270 67.5
Total 400 100.0 400 100.0
Attainment of formal education
 No 238 59.5 30 7.5
 Yes 162 40.5 370 92.5
Total 400 100.0 400 100.0
Levels of education
 Primary 102 63.0 16 4.3
 Lower secondary 43 26.5 76 20.5
 Secondary and higher secondary 14 8.6 203 54.9
 University 3 1.9 75 20.3
 Total 162 100.0 370 100.0
Duration of work in years
 ≤ 5 years 265 66.2 237 59.2
 6–10 years 63 15.8 113 28.2
 11–15 years 30 7.5 28 7.0
 16–20 years 23 5.8 19 4.8
 ≥ 21 years 19 4.8 3 0.8
 Total 400 100.0 400 100.0
Ever smoker
 No 238 59.5 260 65.0
 Yes 162 40.5 140 35.0
 Total 400 100.0 400 100.0
Current smoker
 No 26 16.0 20 14.3
 Yes 136 84.0 120 85.7
 Total 162 100.0 140 100.0
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