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Table 1 Study population characteristics for boilermaker participants (n = 26)

From: PM2.5 metal exposures and nocturnal heart rate variability: a panel study of boilermaker construction workers

Characteristics

Mean ± SD

or n (%)

Male

26 (100)

Age (yrs)a

43 ± 11

   Range

29 – 64

Race

 

   White

21 (81)

   Black

1 (4)

   Hispanic

3 (12)

   Asian

1(4)

Current Smoker

7 (26)

Hypertensive

5 (20)

Nightb rMSSD (msec)

 

   Workdayc

30.3 ± 16.0

   Non-workdayc

32.0 ± 16.0

  1. aAt study entry. b(00:00 to 07:00) cOver 31 measurement occasions.