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Table 2 Age at asthma symptom onset among cases

From: Early life swimming pool exposure and asthma onset in children – a case-control study

Age at asthma symptom onset

Number

Percent

Pre-school onset

< 1 years of age

15

4.5%

1 year

60

17.8%

2 years

21

6.2%

3 years

17

5.0%

4 years

16

4.7%

5 years

13

3.9%

6 years

26

7.7%

School-age onset

7–15 years

169

50.1%

All cases

 

337

100.0%