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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