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Table 1 Characteristics of study subjects

From: Development of breath test for pneumoconiosis: a case-control study

 

Cases (n = 25)

Controls (n = 154)

Men, %

68.0

46.1

Age (yrs.), mean (SD)

60.0 (9.2)

50.3 (11.8)

Duration of stone work (yrs.), mean (SD)

19.8 (14.5)

17.6 (13.8)

BMI (SD)

25.7 (3.6)

25.1 (3.9)

FVC (% of predicted) (SD)

74.3 (9.5)

93.8 (14.3)

FEV1 (% of predicted) (SD)

75.6 (9.4)

95.4 (14.4)

FEV1/FVC (%) (SD)

83.2 (6.8)

84.0 (7.7)

FEF25–75 (% of predicted) (SD)

72.9 (20.7)

87.9 (25.0)

Cigarette smoking

 Pack years, mean (SD)

39.2 (35.6)

39.0 (24.8)

 Never smoked, %a

44.0

66.2

 Former smoker, %

16.0

11.0

 Current smoker, %

40.0

22.7

 Passive smoking, %b

60.0

40.3

Possible exposure to asbestos, %c

96.0

73.4

  1. a“Never smoked” means having smoked fewer than 20 packs of cigarettes in a lifetime or less than one cigarette per day for 1 year
  2. b“Passive smoking” means having been exposed to others smoking more than three times per week for more than 6 months
  3. cOccupational exposure to asbestos at ship demolition, asbestos cement, or carving asbestos-contaminated ores including nephrite, serpentine, and talc