Table 2—

Reported morbidity

Cases nControls nChi-squareddfOR for factor level95% CI
Current night-time symptoms5.781
 No57741.00
 Yes54372.001.12–3.58
Frequency of night-time symptoms when asthma is troublesome9.022
 None13291.00
 Once or twice per week27262.501.00–6.23
 Frequently58433.331.43–7.74
Frequency of exercise symptoms when asthma is troublesome12.222
 None20371.00
 Once or twice per week22261.700.72–3.98
 Frequently53323.781.66–8.63
School absence due to asthma in past 6 months9.792
 None50731.00
 <1 week33231.971.01–3.82
 >1 week27142.821.27–6.27
  • df: degrees of freedom

  • OR: odds ratio

  • CI: confidence interval