Table 5. Multivariate exact logistic regression for associations with clustering among MDR TB infections, California, USA, 2004–2007*.

Strain	OR (95% CI)	p value
katG S315T	11.2 (2.2 – ∞ )	0.004
East-Asian lineage	3.1 (0.9 – 12.2)	0.08
Sputum smear–positivity	3.1 (0.9 – 11.7)	0.07
Refugee status	6.0 (1.2 – 36.2)	0.03

*MDR TB, multidrug-resistant tuberculosis; OR, odds ratio; CI, confidence interval.