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Table 5 Adjusted OR for pre-school asthma vs controls in relation to the number of hours spent in swimming pools before asthma onset (Unexposed as reference)

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

  Low-to intermediate exposure High exposure Any exposure
Age OR (95% CI) OR (95% CI) OR (95% CI)
1y (n = 153) 2.25 (1.39 3.65) 1.73 (1.08 2.76) 1.95 (1.33 2.86)
2y (n = 93) 1.86 (1.10 3.16) 1.75 (0.94 3.25) 1.82 (1.14 2.90)
3y (n = 72) 1.82 (1.01 3.29) 1.48 (0.75 2.91) 1.68 (0.98 2.86)
4y (n = 55) 1.23 (0.63 2.40) 1.14 (0.53 2.42) 1.19 (0.65 2.20)
5y (n = 39) 0.89 (0.38 2.07) 1.51 (0.64 3.56) 1.13 (0.53 2.39)
6y (n = 26) 0.94 (0.31 2.78) 0.95 (0.29 3.09) 0.94 (0.34 2.65)
  1. Exposure = Cumulative number of hours
  2. Analysis at 1 years = the relationship between exposure in the first year of life and asthma onset between 1 and 6 years of age. Analysis at 2 years = the relationship between exposure in the first two years of life and asthma onset between 2 and 6 years of age. Analysis at 3 years = the relationship between exposure in the first three years of life and asthma onset between 3 and 6 years of age, etc