Table 4.

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

Antigen or mitogenValue typeLevel (pg/ml) for group (n):
CD (101)UC (31)Control (169)
M. aviumPPDMedian0b 1.01.5
Mean ± SEM 7.1 ± 2.43.5 ± 1.39.7 ± 2.3
Range 0–209 0–29 0–321
M. bovisPPDMedian0c 1.01.0
Mean ± SEM16.5 ± 8.92.2 ± 0.86.3 ± 1.5
Range 0–776 0–24 0–189
PHAMedian831b 9631,059
Mean ± SEM 731 ± 49744 ± 80864 ± 33
Range 0–1,600 0–1,200 0–1,600
  • a Kruskal-Wallis nonparametric ANOVA with Dunn's multiple comparisons test. The UC group was not different from controls for any antigen or mitogen.

  • b CD values were lower than controls, P < 0.01.

  • c CD values were lower than controls, P < 0.001.