TABLE 2.
FEV1 CHARACTERISTICS OF WORLD TRADE CENTER–EXPOSED FDNY RESCUE WORKERS BY ARRIVAL TIME–BASED WORLD TRADE CENTER EXPOSURE
| Last FEV1 before 09/11/2001 (Median, Interquartile Range, and Percent)
|
First FEV1 after 09/11/2001 (Median, Interquartile Range, and Percent)
|
|||||
|---|---|---|---|---|---|---|
| Arrival Time–based WTC Exposure | Liters | Percent Predicted | Percent Below Lower Limit of Normal | Liters | Percent Predicted | Percent Below Lower Limit of Normal |
| Early exposure (n = 1,660) | 4.21 (3.64–4.73) | 101 (92–111) | 7.7 | 3.85† (3.34–4.36) | 93† (84–102) | 19.2† |
| Intermediate exposure (n = 8,185) | 4.32 (3.83–4.83) | 101 (92–111) | 6.4 | 3.96† (3.52–4.42) | 93† (85–102) | 16.3† |
| Late exposure (n = 1,921) | 4.27 (3.78–4.76) | 100 (91–110) | 7.8* | 3.87†‡ (3.42–4.32) | 92†‡ (83–102) | 17.8*† |
| Total | 4.30 (3.80–4.80) | 101 (92–111) | 6.8 | 3.93 (3.47–4.40) | 93 (85–102) | 15.3 |
Definition of abbreviations: FDNY = Fire Department of New York City; WTC = World Trade Center.
Mean (± SD) time interval between last measurement before and first measurement after 09/11/2001 was 2.13 ± 0.83 yr and did not differ significantly among exposure groups.
p < 0.001 among early-, intermediate-, and late-exposure groups (analysis of variance for FEV1 in liters or percent predicted; χ2 for percentage below lower limit of normal).
p < 0.001 between last measurement before and first measurement after 09/11/2001 within exposure group (paired t test for FEV1 in liters or percent predicted; McNemar's test for percentage below lower limit of normal).
p < 0.05 among early-, intermediate-, and late-exposure groups (analysis of variance for FEV1 in liters or percent predicted; χ2 for percentage below lower limit of normal).