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Table 3 The characteristics of workers in the control and CB-exposed groups

From: Reduced pulmonary function and increased pro-inflammatory cytokines in nanoscale carbon black-exposed workers

Variables

Control group (n = 104)

CB-exposed group (n = 81)

P

Age (years, mean ± SD)

44.5 ± 5.94

45.9 ± 5.42

0.108a

BMI (kg/m2, mean ± SD)

25.0 ± 3.30

25.1 ± 3.93

0.887a

Current smoker, yes/no (% yes)

68/36 (65.4)

56/25 (69.1)

0.590b

Pack years of smoking

17.87 ± 12.21

13.20 ± 8.92

0.019a

Never smoking (% never)

31/73(29.8)

22/59(27.2)

0.693a

Alcohol user, yes/no (% yes)c

15/87 (14.7)

12/69 (14.8)

0.984b

Working year (years, mean ± SD)

---

12.5 ± 11.07

---

Work shift before the physical test, at work/at rest (% at work)

84/20 (80.8)

72/9 (88.9)

0.150b

Night shift within last week, yes/no (% yes)

80/24 (76.9)

65/16 (80.0)

0.558b

  1. at-test was used to compare values from both groups. Differences were considered significant when P < 0.05. bChi square test was used to compare values from both groups. cTwo missing values in the control group. Differences were considered significant when P < 0.05.