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.

	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