Dairy workers (n = 185)

Control workers (n = 45)

Mean (SD)

Median

n

%

Mean (SD)

Median

n

%

Never smokers

101

54.6

31

68.9

Former smokers

36

19.5

8

17.8

Current smokers

48

25.9

6

13.3

Pack yearsa

5.5 (7.1)

3.1

3.72 (4.7)

1.7

Cigarettes per dayb

8.2 (1)

5

4.5 (1.5)

2.5

Shift use

25

13.5

0

0.0

Cigarettes per shiftc

4 (3.3)

3

0

0

Exposure to second-hand smoke

None

97

52.4

27

60.0

At home only

42

22.7

13

28.9

At work only

43

23.2

5

11.1

At home and work

3

1.6

0

0.0

Time exposed at work during observed shift (mins)

26.9 (7.5)

10

0.2 (0.2)

0.5