Table 4 Number of subjects who reported a specific symptom in the first survey (1991/1992), number of deaths observed during the follow-up (1991–2000), crude annual mortality rate (*10,000/year), and its 95% Confidence Interval.
From: Incidence of asthma and mortality in a cohort of young adults: a 7-year prospective study
|  | Number of subjects at risk | Deaths during 1991–2000 | Annual mortality rate*10,000 | 95% Confidence Interval |
|---|---|---|---|---|
No respiratory symptoms | 3225 | 26 | 11.4 | 7.7–16.7 |
Wheezing | 600 | 4 | 9.4 | 3.5–25.1 |
Allergic rhinitis | 959 | 7 | 10.5 | 5.0–22.1 |
Nocturnal Cough | 1771 | 10 | 8.0 | 4.3–14.8 |
Nocturnal Tightness | 1771 | 8 | 23.5 | 11.7–46.9 |
Nocturnal Dyspnoea | 429 | 9 | 30.3 | 15.8–58.3 |
Asthma attacks | 221 | 5 | 32.2 | 13.4–77.3 |