Table 5

Skin test results in two step tuberculin testing by different antigens

BCG (+) > 10mm/total (%)BCG (–) > 10mm/total (%)RR95% CIp value
PPD 5TU23,24,33,40
Initial test519/1709 (30.4%)681/3074 (22.2%)1.371.24 to 1.51<0.0001
Second test189/1086 (17.4%)241/2241 (10.8%)1.611.35 to 1.94<0.0001