Table 2.

Factors associated with positive of the T-SPOT.TB diagnostic tests in smear-negative PTB patients.

Factors	Total N = 858	No.(%) with positive results	Univariate OR (95% CI)	Multivariate adjusted OR (95% CI)	P
Gender
Male	584	508(87.0)	Reference
Female	274	234(85.4)	0.875(0.579–1.323)
Age
<45years	469	425(90.6)	2.555(1.607–4.061)	2.132(1.302–3.489)	0.003
45–59years	193	162(83.9)	1.382(0.825–2.315)	1.287(0.763–2.171)	0.345
≥60years	196	155(79.1)	Reference	Reference
Smoking
No	612	526(85.9)	Reference
Yes	246	216(87.8)	1.177(0.755–1.837)
Diabetes
No	794	687(86.5)	Reference
Yes	64	55(85.9)	0.952(0.457–1.982)
BMI
<18.5	174	158(90.8)	Reference
≥18.5	684	584(85.4)	0.591(0.339–1.031)
Contact of TB
No	907	694(86.0)	Reference
Yes	51	48(94.1)	2.605(0.798–8.506)
BCG
No	442	371(83.9)	Reference
Yes	416	351(84.3)	1.078(0.757–1.354)
TB Category
New	715	626(87.6)	Reference	Reference	0.211
Retreatment	143	116(81.1)	0.611(0.380–0.981)	0.730(0.446–1.195)
Course
<1 month	236	210(89.0)	Reference
≥1month	622	532(85.5)	0.732(0.460–1.165)
Albumin
Decreased	145	114(78.6)	Reference	Reference	0.046
Normal	713	628(88.1)	2.009(1.272–3.173)	1.629(1.008–2.631)