Table 1.
Demographic characteristics of the study population
| Characteristic | Mean ± SD or N |
|---|---|
| Sample size | 52a |
| Sample collecting time | |
| Morning and afternoon | 29 |
| Afternoon and evening | 23 |
| Age (years) | 40.91 ± 12.22 |
| Welding time (hours/month) | 33.06 ± 25.51 |
| BMI (kg/m2) | 28.43 ± 5.41 |
| Weight (kg) | 89.53 ± 17.89 |
| Height (m) | 1.77 ± 0.08 |
| Gender | |
| Male | 50 |
| Female | 1 |
| Race | |
| Caucasian | 43 |
| African American | 4 |
| Asian | 2 |
| Hispanic | 2 |
| Current smoker | |
| Yes | 21 |
| No | 30 |
| Medical history | |
| Diabetes | 4 |
| High blood pressure | 5 |
| Irregular heart arrhythmia | 2 |
| High cholesterol hyperlipidemia | 7 |
aBaseline information of one sample was missing