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Table 6 Adjusted OR for pre-school asthma in relation to exposure before asthma onset by allergic sensitization

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

  Exposed with SPT- Unexposed with SPT+ Exposed with SPT+
  OR (95% CI) OR (95% CI) OR (95% CI)
1y (n = 102) 1.69 (0.78 3.67) 8.22 (4.32 15.64) 13.68 (6.44 29.08)
2y (n = 62) 0.96 (0.30 3.08) 9.77 (4.00 23.90) 19.85 (7.77 50.71)
3y (n = 48) 1.29 (0.33 5.04) 11.47 (3.39 38.84) 24.14 (7.57 76.96)
4y (n = 35) 0.83 (0.13 5.20) 12.62 (2.43 65.44) 24.43 (5.29 112.80)
5y (n = 26) 0.37 (0.05 2.79) 10.16 (1.85 55.91) 11.38 (2.35 55.12)
6y (n = 18) 0.61 (0.06 6.25) 6.66 (0.52 84.91) 9.10 (1.09 76.35)
  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. 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. The reference group is unexposed with SPT-. SPT + =positive skin prick test; SPT- = negative skin prick test