Table 4. Characteristics of the 37 subjects in 2004.
| Parameters | Toner–handling group | Non–toner–handling group | t value | p value | |||
|---|---|---|---|---|---|---|---|
| No. of subjects | 13 | 24 | |||||
| Sex | |||||||
| Male, n / (%) | 12 | (92.3) | 23 | (95.8) | |||
| Female, n / (%) | 1 | (8.3) | 1 | (4.2) | |||
| Age, Mean / (SD) | 40.5 | (7.4) | 39.1 | (6.5) | 0.588 | 0.565 | |
| Age group (years), n / (%) | |||||||
| 20–29 | 1 | (7.7) | 2 | (8.3) | |||
| 30–39 | 4 | (30.8) | 10 | (41.7) | |||
| 40–49 | 7 | (53.8) | 11 | (45.8) | |||
| 50–59 | 1 | (7.7) | 1 | (4.2) | |||
| BMI, Mean / (SD) | 23.9 | (4.6) | 23.0 | (2.4) | 0.784 | 0.438 | |
| Smoking | |||||||
| Never smoker, n / (%) | 4 | (30.8) | 8 | (33.3) | |||
| Former smoker 1a, n / (%) | 1 | (7.7) | 4 | (16.7) | |||
| Former smoker 2b, n / (%) | 4 | (30.8) | 6 | (25.0.) | |||
| Current smoker, n / (%) | 4 | (30.8) | 6 | (25.0) | |||
| PI of respiratory system | |||||||
| bronchiectasis | 1 | ||||||
| PMH of respiratory system | |||||||
| pneumonia, bronchitis | 1 | 1 | |||||
| pleuritis | 1 | ||||||
BMI: body mass index, SD: standard deviation, PI: present illness, PMH: past medical history,
a Former smoker 1 were group of subjects who had ceased smoking before 2003. b Former smoker 2 were subjects who had ceased smoking during the years of the survey.