Table 1.

Distribution of ADA₁ phenotypes in asthmatic patients and in controls

	Carriers of ADA1*2 allele (% proportion)	Total (n°)	Chi square test of independence	ODDS Ratio
ITALIAN POPULATION
Asthmatic children	11.4%	291	p=0.02	O.R.=0.637
Control children	16.7%	1417		95%C.I. 0.42–0.95
CHINESE POPULATION
Asthmatic adults	10.0%	120	p=0.002	O.R.=0.318
Control adults	25.9%	116		95%C.I. 0.14–0.69

Cumulative Chi square test of independence of ADA₁*2 allele and asthma p=0.0004.