Research Article
A Cohort Study on Self-Reported Respiratory Symptoms of Toner-Handling Workers: Cross-Sectional and Longitudinal Analysis from 2003 to 2008
Table 3
Prevalence of self-reported respiratory symptoms.
| | | 1st survey | 2nd survey | 3rd survey | 4th survey | 5th survey | 6th survey | | | Toner-handling group | Never-toner-handling group | value# | Toner-handling group | Never-toner-handling group | value# | Toner-handling group | Never-toner-handling group | -value# | Toner-handling group | Never-toner-handling group | -value# | Toner-handling group | Never-toner-handling group | -value# | Toner-handling group | Never-toner-handling group | -value# |
| |
Subjects number |
1071 |
415 | |
1045 |
388 | |
1028 |
371 | |
1016 |
361 | |
993 |
352 | |
986 |
342 | | | Persistent cough (%) | 47 (4.4%) | 19 (4.6%) | 0.89 | 38 (3.6%) | 17 (4.4%) | 0.54 | 44 (4.3%) | 14 (3.8%) | 0.76 | 34 (3.3%) | 18 (5.0%) | 0.20 | 44 (4.4%) | 9 (2.6%) | 0.15 | 40 (4.1%) | 12 (3.5%) | 0.75 | | Persistent phlegm (%) | 50 (4.7%) | 12 (2.9%) | 0.15 | 41 (3.9%) | 13 (3.4%) | 0.75 | 42 (4.1%) | 8 (2.2%) | 0.10 | 38 (3.7%) | 10 (2.8%) | 0.50 | 38 (3.8%) | 7 (2.0%) | 0.12 | 44 (4.5%) | 10 (2.9%) | 0.27 | | Persistent cough and phlegm (%) | 18 (1.7%) | 4 (1.0%) | 0.47 | 7 (0.7%) | 8 (2.1%) | 0.04 | 16 (1.6%) | 6 (1.6%) | 1.00 | 15 (1.5%) | 7 (1.9%) | 0.62 | 19 (1.9%) | 2 (0.6%) | 0.13 | 21 (2.1%) | 4 (1.2%) | 0.36 | | Wheezing without asthmatic response (%) | 68 (6.3%) | 18 (4.3%) | 0.17 | 57 (5.5%) | 10 (2.6%) | 0.02* | 45 (4.4%) | 10 (2.7%) | 0.16 | 48 (4.7%) | 10 (2.8%) | 0.13 | 29 (2.9%) | 10 (2.8%) | 1.00 | 24 (2.4%) | 13 (3.8%) | 0.19 | | Breathlessness (%) | 111 (10.4%) | 22 (5.3%) | <0.01** | 92 (8.8%) | 19 (4.9%) | 0.01* | 80 (7.8%) | 12 (3.2%) | <0.01** | 69 (6.8%) | 16 (4.4%) | 0.13 | 66 (6.6%) | 11 (3.1%) | 0.02* | 57 (5.8%) | 8 (2.3%) | <0.01** |
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value of Chi-square test, and .
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