TABLE 4.

IFN-γ levels in plasma after stimulation of whole blood with mycobacterial antigens or PHA for U.S. outpatient study groups^a

Antigen or mitogen	Value type	Level (pg/ml) for group (n):
		CD (101)	UC (31)	Control (169)
M. avium PPD	Median	0b	1.0	1.5
	Mean ± SEM	7.1 ± 2.4	3.5 ± 1.3	9.7 ± 2.3
	Range	0–209	0–29	0–321
M. bovis PPD	Median	0c	1.0	1.0
	Mean ± SEM	16.5 ± 8.9	2.2 ± 0.8	6.3 ± 1.5
	Range	0–776	0–24	0–189
PHA	Median	831b	963	1,059
	Mean ± SEM	731 ± 49	744 ± 80	864 ± 33
	Range	0–1,600	0–1,200	0–1,600

^aKruskal-Wallis nonparametric ANOVA with Dunn's multiple comparisons test. The UC group was not different from controls for any antigen or mitogen. 

^bCD values were lower than controls, P < 0.01. 

^cCD values were lower than controls, P < 0.001.