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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%