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Table 2 Description of selected characteristics in 38 boilermakers at the time of their first recruitment

From: A panel study of occupational exposure to fine particulate matter and changes in DNA methylation over a single workday and years worked in boilermaker welders

 

N

Mean (SD) or Percent

Range

Cohort characteristics

Age (years)a

34

36.0 (12.0)

21.3-61.0

Males

38

100%

 

Race

   

 Caucasian

31

83.3%

 

 African-American

5

11.1%

 

 Hispanic

2

5.6%

 

Current smoker

 Yes

12

30.6%

 

 No

26

69.4%

 

Years worked as boilermakerb

36

6.8 (9.4)

1 - 35

Exposure characteristics c

  

Median (IQR) or Percent

PM2.5 exposure (mg/m3)c

54

0.52 (1.34)

0.02-3.41

Weld day samplesd

   

 Yes

44

81.5%

 

 No

10

18.5%

 

Used respirator

   

 Yes

13

24.1%

 

 No

41

75.9%

 
  1. aAge at initial participation in the study. Missing age = 2.
  2. bMissing self-reported number of years working as a boilermaker = 2.
  3. cDescriptive statistics based on 54 observation days.
  4. dMissing personal PM2.5 measurements = 2.