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. 2013 Dec 1;12:101. doi: 10.1186/1476-069X-12-101

Table 2.

Characteristic of participants, stratified by cohort and dust exposure groups

 
 Offspring
 Third generation
 Total
(n = 1247)
 (n = 3538)
 (n = 4785)
 
 Less likely dust exposure
 Highly likely dust exposure
 Less likely dust exposure
 Highly likely dust exposure
 Less likely dust exposure
 Highly likely dust exposure
  (n = 1126) (n = 121) (n = 3112) (n = 426) (n = 4238) (n = 547)
Male, n (%)
 444 (39.43)
 100 (82.64)
 1298 (41.71)
 378 (88.73)
 1742 (41.10)
 478 (87.39)
FEV1, L ± SD
 2.71 ± 0.78
 3.09 ± 0.75
 3.54 ± 0.78
 4.02 ± 0.71
 3.32 ± 0.86
 3.81 ± 0.82
FEV1/FVC, % ± SD
 0.73 ± 0.07
 0.72 ± 0.08
 0.78 ± 0.06
 0.77 ± 0.06
 0.77 ± 0.07
 0.76 ± 0.07
FEV1/FVC < 70%, n (%)
 337 (29.93)
 43 (35.54)
 318 (10.22)
 49 (11.50)
 655 (15.46)
 92 (16.82)
Age, years ± SD
 62.83 ± 8.02
 60.48 ± 7.87
 39.81 ± 8.58
 41.03 ± 8.57
 45.93 ± 13.21
 45.33 ± 11.66
Height, inches ± SD
 65.81 ± 3.76
 67.99 ± 3.46
 66.90 ± 3.65
 69.29 ± 2.98
 66.61 ± 3.71
 69.01 ± 3.14
Pack-years* ± SD
 21.40 ± 21.58
 30.73 ± 23.32
 12.56 ± 13.61
 19.12 ± 15.90
 15.50 ± 17.19
 22.07 ± 18.74
Smoking status, n (%)
Never smokers
 501 (44.49)
 36 (29.75)
 1854 (59.58)
 177 (41.55)
 2355 (55.57)
 213 (38.94)
Former smokers
 522 (46.36)
 58 (47.93)
 789 (25.35)
 115 (27.00)
 1311 (30.93)
 173 (31.63)
Current smokers 103 (9.15) 27 (22.31) 469 (15.07) 134 (31.46) 572 (13.50) 161 (29.43)

*Pack-years mean and standard deviation calculated among current and former smokers.