Table 3—

Cooperative effect of adenosine deaminase (ADA) and secretor-ABO complex on susceptibility to asthma in children: Chi-squared test (X2) of independence (asthmatics versus controls)

X 2 dfp-value
a versus b versus c versus d8.62130.045
a versus (b+c) versus d8.45220.015
a versus d7.64010.006
  • a: nonsecretor/O-ADA*1*1

  • b: nonsecretor/O-ADA*2 carrier

  • c: other phenotypes-ADA*1*1

  • d: other phenotypes-ADA*2 carrier

  • df: degrees of freedom