Table 3. Clinical factors associated with a positive TST through univariate and multivariate analyses during the two-step period.
| Clinical factor | TST | Univariate analysis | Multivariate analysis | |||||
| Negative (n = 575) | Positive (n = 386) | OR | 95% CI | P | OR | 95% CI | P | |
| Age (yrs), median (range) | 25 (21–47) | 29 (20–54) | 1.16 | 1.13–1.20 | <0.001 | 1.15 | 1.10–1.21 | <0.001 |
| Gender; male, n (%) | 191 (33.2) | 165 (42.7) | 1.50 | 1.15–1.96 | 0.003 | 1.21 | 0.78–1.87 | 0.405 |
| BMI (median, IQR) | 20.2 (18.9–22.3) | 20.9 (19.5–22.8) | 1.09 | 1.03–1.15 | 0.005 | 1.02 | 0.95–1.10 | 0.541 |
| Rejoined | 26 (4.5) | 35 (9.1) | 2.11 | 1.25–3.56 | 0.005 | 0.90 | 0.46–1.77 | 0.769 |
| Previous TB history | 0 (0.0) | 4 (1.0) | – | – | ||||
| Findings of CXRs* | ||||||||
| Normal | 551 (96.2) | 358 (92.7) | 1.00 | 1.00 | ||||
| Previously healed TB | 22 (3.8) | 28 (7.3) | 1.96 | 1.10–3.48 | 0.022 | 1.66 | 0.78–3.52 | 0.187 |
| Active pulmonary TB | 0 (0.0) | 0 (0.0) | ||||||
| Job category | ||||||||
| Doctor | 205 (35.7) | 158 (40.9) | 1.08 | 0.78–1.49 | 0.642 | |||
| Nurse | 125 (21.7) | 70 (18.1) | 0.78 | 0.54–1.15 | 0.211 | |||
| Technician$ | 91 (15.8) | 48 (12.4) | 0.74 | 0.48–1.13 | 0.164 | |||
| Others | 154 (26.8) | 110 (28.5) | 1.00 | |||||
TST, tuberculin skin test; BMI, body mass index; IQR, interquartile range; TB, tuberculosis; CXR, simple chest radiography; OR, odds ratio; CI, confidence interval.
*
Data could not be obtained for two participants.
$
Technicians were defined as technical employees performing radiologic, laboratory, pathologic, and physiotherapeutic services.