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QFT conversion (IFN-γ ≥ 0.70 IU/mL) at 18 months by quartiles of number of cigarettes smoked among persons who inject drugs in Tijuana, Mexico, 2006–2008.
| Number of cigarettes smoked daily (quartiles) | QFT conversion | P value |
|---|---|---|
| 0–5 | 13/30 (43.3) |
0.716 |
| 6–10 | 16/36 (44.4) | |
| 11–15 | 15/37 (40.5) | |
| 16+ | 8/26 (30.8) |
*P value for the difference in QFT conversion at 18 months across quartiles was generated using the Pearson's χ 2 test.
IFN-γ: interferon-gamma; QFT: QuantiFERON-TB Gold In-Tube.
