Skip to main content

Table 4 Adjusted OR for pre-school asthma and school-age asthma, respectively, in relation to cumulative exposure before asthma onset (Unexposed as reference)

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

Pre-school asthma School-age asthma
  Low-to intermediate exposure High exposure Any Exposure Any Exposure
Age OR (95% CI) OR (95% CI) OR (95% CI) Age OR (95% CI)
1y (n = 153) 1.97 (1.26–3.07) 1.93 (1.12–3.33) 1.95 (1.33–2.86) 1y (n = 169) 1.25 (0.87–1.80)
2y (n = 93) 2.07 (1.23–3.48) 1.42 (0.73–2.76) 1.82 (1.14–2.90) 2y (n = 169) 1.19 (0.83–1.69)
3y (n = 72) 1.93 (1.08–3.44) 1.26 (0.60–2.64) 1.68 (0.98–2.86) 3y (n = 169) 1.24 (0.87–1.77)
4y (n = 55) 1.25 (0.65–2.41) 1.07 (0.47–2.43) 1.19 (0.65–2.20) 4y (n = 169) 1.13 (0.78–1.65)
5y (n = 39) 1.19 (0.53–2.67) 1.01 (0.39–2.61) 1.13 (0.53–2.39) 5y (n = 169) 1.09 (0.72–1.64)
6y (n = 26) 0.81 (0.27–2.43) 1.21 (0.38–3.91) 0.94 (0.34–2.65) 6y (n = 169) 1.21 (0.73–2.00)
  1. Analysis at 1 years = the relationship between exposure in the first year of life and asthma onset between 1 and 6 years of age (pre-school asthma), and between 7 and 15 years of age (school-age asthma), respectively. 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, and between 7 and 15 years of age, respectively. 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, and between 7 and 15 years of age, etc