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Table 1 Prevalence (%) of demographics and conditions among responders and non-responders in the current case-control study

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

Cases, n = 405 Responders (n = 337) Non-responders (n = 68) p
Sex (boy) 54.6% 54.4% 0.98
Current wheeze 47.6% 42.4% 0.44
Any SPT+ at age 12y 64.3% 58.7% 0.48
Paternal smoking 16.0% 7.8% 0.09
Maternal smoking 13.5% 10.6% 0.53
Own smokinga 5.7% 7.5% 0.59
Controls, n = 809 Responders (n = 633) Non-responders (n = 176) p
Sex (boy) 47.9% 54.0% 0.15
Current wheeze 0.3% (n = 2) 1.2% (n = 2) 0.17
Any SPT+ at age 12y 20.1% 18.7% 0.77
Paternal smoking 10.8% 18.0% 0.01
Maternal smoking 12.8% 14.9% 0.49
Own smokinga 5.1% 5.7% 0.75
  1. Based on data reported in the questionnaire survey of the entire cohort at 14–15 years of age and the skin prick tests performed at age 11–12 years. The proportion of missing values on the questionnaire questions was < 4%
  2. aMore than “never” or “almost never”