Table 2.

Main effects model on all chromosomes

Variable	Level	Coefficient	SD	p-Value
Smoking	-	1.0434	0.1214	10-18
Sex	-	1.0819	0.1251	10-18
SNP6_154	1	-1.6228	0.1395	10-31
SNP6_162	1	2.2717	0.2885	10-15
HLA DR type, father	2	2.3848	0.1405	10-64
HLA DR type, mother	2	2.3443	0.1388	10-64
SNP6_154	2	-3.0081	0.5492	10-8
SNP11_389	2	0.9521	0.1264	10-14

^aFor SNPs, level is the number of variant alleles. For DR type, level = 1 means DR1 and level = 2 means DR4.