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Table 3 Chronic respiratory symptoms/illnesses for the response groups

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

Respiratory illnesses Exposed Referent
Frequency % Frequency %
Cough
 Absent 179 44.8 285 71.2
 Present 221 55.2 115 28.8
 Total 400 100.0 400 100.0
Usually cough as much as 4 to 6 times a day, 4 or more days out of the week
 Absent 103 25.8 64 16.0
 Present 118 29.5 51 12.8
 Does not apply 179 44.8 285 71.3
 Total 400 100.0 400 100.0
 Chronic cough
  Absent 209 85.7 151 93.2
  Present 35 14.3 (9.91–18.69) 11 6.8 (2.92–10.68)
  Total 244 100.0 162 100.0
 Phlegm
  Absent 231 57.8 355 88.8
  Present 169 42.2 45 11.2
  Total 400 100.0 400 100.0
Usually bring up phlegm as much as 4 to 6 times a day, 4 or more days out of the week
 Absent 137 34.3 74 18.5
 Present 32 8.0 12 3.0
 Does not apply 231 57.8 314 78.5
 Total 400 100.0 400 100.0
Chronic phlegm
 Absent 141 83.4 81 94.2
 Present 28 16.6 (10.99–22.21) 5 5.8 (0.86–10.74)
 Total 169 100.0 86 100.0
Episodes of cough and phlegm
 Absent 302 75.5 336 84.0
 Present 98 24.5 64 16.0
 Total 400 100.0 400 100.0
Chronic episodes of cough and phlegm
 Absent 324 81.0 357 89.3
 Present 76 19.0 (15.16–22.84) 43 10.8 (7.76–13.84)
 Total 400 100.0 400 100.0
Wheezing on most days or nights
 Absent 355 88.8 392 98.0
 Present 45 11.3 8 2.0
 Total 400 100.0 400 100.0
Attack of wheezing cause shortness of breath (asthma)
 Absent 375 93.8 393 98.3
 Present 25 6.3 7 1.8
 Total 400 100.0 400 100.0
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