Table 4:
Risk Factors for Incident Tuberculosis Disease during 1-Year Follow-up
| Variable | RR | 95% CI |
|---|---|---|
| Intercept | 0.01 | (0.00–0.04) |
| Demographics | ||
| Male | 1.18 | (0.87–1.60) |
| Age | 0.96 | (0.91–1.01) |
| Socioeconomic status | ||
| Poor roof | 1.25 | (0.59–2.63) |
| Overcrowded | 1.04 | (0.77–1.40) |
| Exposure | ||
| SCPI | 2.82 | (1.72–4.61) |
| CPI | 1.47 | (0.78–2.77) |
| TST | ||
| R | 5.15 | (2.32–11.40) |
| R × Age | 0.96 | (0.93–0.99) |
| LTBI | 7.83 | (4.22–14.51) |
| LTBI × Age | 0.96 | (0.94–0.98) |
| Interventions | ||
| BCG | 0.23 | (0.09–0.60) |
| BCG × Age | 1.05 | (1.00–1.11) |
| IPT | 0.33 | (0.16–0.68) |
| IPT × Age | 1.00 | (0.95–1.05) |
Definition of abbreviations: BCG = bacillus Calmette-Guérin; CI = confidence interval; CPI = smear-negative and culture-positive index cases; IPT = isoniazid preventive therapy; LTBI = latent TB infection; R = reactive; RR = risk ratio; SCPI = smear-positive and culture-positive index cases; TST = tuberculin skin test.
Statistically significant coefficients (P < 0.05) are highlighted in bold. LTBI is assessed using baseline skin test response. R state indicates TST > 0 mm and < 10 mm. LTBI indicates TST ≥ 10 mm.