Table 1.
Demographic variables and levels of exposure to particles
| Parameter | Exposed group Mean (SD) |
Reference group Mean (SD) |
p-value | |
|---|---|---|---|---|
| Age (years) | 36.60 (8.68) | 33.49 (8.68) | 0.670 a | |
| Work history (years) | 8.93 (8.18) | 9.00 (5.07) | 0.963 a | |
| Height (cm) | 171.82 (7.83) | 174.24 (7.50) | 0.138 a | |
| Weight (kg) | 80.28 (12.55) | 74.02 (16.97) | 0.051 a | |
| Number (Percent) | ||||
| Smoking status | Yes | 10 (71.40) | 4 (28.60) | 0.144 b |
| No | 35 (46.10) | 41 (53.90) | ||
| Marital status | Single | 14 (100.00) | 0 (0.00) | < 0.001 b |
| Married | 31 (40.80) | 45 (59.20) | ||
| Level of education | No degree | 21 (100.00) | 0 (0.00) | < 0.001 b |
| Elementary education | 4 (80.00) | 1 (20.00) | ||
| High school diploma | 16 (84.20) | 3 (15.80) | ||
| Associate degree | 2 (11.10) | 16 (88.90) | ||
| Bachelor degree | 2 (13.30) | 13 (86.70) | ||
| Masters degree | 0 (0.00) | 12 (100.00) | ||
| Respirable dust concentration (mg/m3) | 1.51 (0.47) | ND | – | |
| Non-respirable dust concentration (mg/m3) | 1.23 (0.41) | ND | ||
Parameters without units are numbers (percent), parameters with units are Mean (SD)
ND not detectable, SD Standard deviation
aIndependent sample t‑test
bχ2-test