Table 2—

Reported morbidity

Cases nControls nChi-squareddfOR for factor level95% CI
Current night-time symptoms5.781
Frequency of night-time symptoms when asthma is troublesome9.022
 Once or twice per week27262.501.00–6.23
Frequency of exercise symptoms when asthma is troublesome12.222
 Once or twice per week22261.700.72–3.98
School absence due to asthma in past 6 months9.792
 <1 week33231.971.01–3.82
 >1 week27142.821.27–6.27
  • df: degrees of freedom

  • OR: odds ratio

  • CI: confidence interval