Group | Subjects n | ESAT6 well | CFP10 well | ||
Correlation# | p-value | Correlation# | p-value | ||
Whole cohort | 134 | 0.336 | <0.001 | 0.243 | <0.01 |
Age <65 yrs | 91 | 0.324 | <0.01 | 0.253 | 0.02 |
Age ≥65 yrs | 43 | 0.422 | <0.01 | 0.197 | 0.21 |
Current smokers | 32 | 0.030 | 0.87 | -0.096 | 0.60 |
Never- or ex-smokers | 102 | 0.375 | <0.001 | 0.308 | <0.001 |
ESAT: early secretary antigenic target; CFP: culture filtrate protein. #: Spearman’s rank correlation coefficients between the tuberculin reaction size and the net spot count (test well count−negative control well count) of T-Spot.TB test.