TABLE 3.

RESPIRATORY SYMPTOMS OF WORLD TRADE CENTER–EXPOSED FDNY RESCUE WORKERS BY ARRIVAL TIME–BASED WORLD TRADE CENTER EXPOSURE

Respiratory Symptom	Early Exposure, % (n = 1,660)	Intermediate Exposure, % (n = 8,185)	Late Exposure, % (n = 1,921)	Total (%)
Cough	63.3	51.1	31.6*	49.7
Wheeze	32.9	24.9	14*	24.2
Chest pain or tightness	33.6	20.4	9.6*	20.5
Exertional dyspnea	55.9	43%	23.3*	41.6
Any lower respiratory symptom	76.5	64.1	40.5*	62

For definition of abbreviations, see Table 2.

^*p < 0.001 among early-, intermediate-, and late-exposure groups (χ²).