Table 3. Association of risk factors with an indeterminate QuantiFERON-TB® Gold In-tube result.

Parameter	n	Univariate analysis		Multivariate analysis
		OR (95% CI)	p	OR (95% CI)	p
Male sex	104	2.96 (0.96–9.18)	0.06	3.25 (1.00–10.49)	0.05
Age>33 years	71	2.75 (1.09–6.91)	0.03	2.51 (0.56–11.28)	0.23
BMI <18.5	98	0.81 (0.33–1.98)	0.64	0.68 (0.26–1.77)	0.43
CD4 cell count <300 cells/µl	62	2.83 (1.14–7.00)	0.02	3.41 (1.25–9.29)	0.02
Lymphocyte count <1640 cells/µl	83	1.42 (0.58–3.45)	0.44	1.21 (0.43–2.92)	0.81
3+ AFB by sputum smear microscopy	70	1.86 (0.61–5.67)	0.27	1.57 (0.57–4.27)	0.38

A total of 23 out of 161 patients (14%) had a QFT-IT indeterminate result. No differences were found in OR when comparing QFT-IT positive and negative patients. OR: Odds Ratio. CI: Confidence interval. BMI: Body Mass Index. Age of 33 years and lymphocyte count of 1640 cells/µl represents medians for all patients. 3+ AFB by sputum smear microscopy: More than 10 acid fast bacilli (AFB) per field.