Table 2.
New-onset respiratory symptoms (percentage) in previously normal residents.a
| Symptom | Exposed (n = 2,103) | Control (n = 254) | Crude IR (95% CI) |
|---|---|---|---|
| Any cough without cold | 40.6 | 12.1 | 3.36 (2.38–4.74)* |
| Nighttime cough | 36.7 | 11.7 | 3.15 (2.21–4.48)* |
| Wheeze | 28.4 | 6.6 | 4.32 (2.68–6.98)* |
| Daytime SOB | 27.2 | 10.4 | 2.62 (1.80–3.83)* |
| Morning chest tightness | 23.7 | 7.9 | 3.00 (2.15–6.94)* |
| SOB after exercise | 18.1 | 4.7 | 3.86 (2.15–6.94)* |
| Nighttime SOB | 15.8 | 4.5 | 3.48 (1.94–6.25)* |
| Any of the above symptoms | 55.8 | 20.1 | 2.78 (2.17–3.56)* |
a
No diagnosis of asthma, chronic obstructive pulmonary disease, chronic bronchitis, or other lung disease before 11 September 2001.
*Effect still statistically significant after adjusting for age, sex, education, smoking, and race.