TABLE 6.

Serum TNF-α levels in DTH+ or DTH− individuals with different genotypes

Phenotype(s)	Mean serum TNF-α level (pg/ml) ± SEM in individuals with genotypea		P valueb
	TNF1/1	TNF1/2
DTH+	26.8 ± 9.1 (20)	53.4 ± 17.8 (13)	0.087
DTH−	13.4 ± 4.1 (21)	38.6 ± 13.7 (29)	0.223
DTH+ and DTH−	20.0 ± 5.0 (41)	44.2 ± 11.1 (42)	0.049c

^aThe numbers of individuals with the indicated genotypes and phenotypes are shown in parentheses. The number of those with the TNF2/2 genotype (n = 3) was too small to provide meaningful data.

^bStatistical analysis was performed with the Mann-Whitney rank sum test since the data were not normally distributed.

^cP < 0.05.