TABLE 3.

Predictors of induced sputum tuberculosis (TB) culture positivity in univariate and multivariate regression analysis

	OR (95% CI)	p-value
Univariate analysis
Age years	0.97 (0.95–0.99)	<0.001
Female	0.88 (0.56–1.4)	0.6
HIV positive#	2.4 (1.3–4.4)	0.005
CD4 count (if HIV positive)	0.999 (0.996–1.001)	0.4
Sputum scarce	1.3 (0.8–2.3))	0.3
Inpatient	2.1 (1.3–3.5)	0.003
Adequate sputum quality	0.78 (0.31–1.94)	0.6
Multivariate analysis¶
Age years	0.972 (0.947–0.997)	0.03
HIV positive	1.88 (0.99–3.54)	0.05
Inpatient	2.06 (1.07–3.93)	0.03

All patients with either a TB culture-positive or-negative induced sputum result were included (n5488). Patients unable to produce an induced sputum sample or with a contaminated culture result were excluded.

^#: missing HIV results meant that n=348 for this univariate analysis and for the subsequent multivariate analyses;

^¶: only variables with a significant p-value are shown for the multivariate analyses.