Table 4. Factors associated with the number of SFCs and positive rate of T-SPOT.TB test among 92 osteoarticular tuberculosis patients.

		Number	T-SPOT.TB test
			ESAT-6		CFP-10		Positive rate
			SFC	P1	SFC	P2	Positive rate(%)	P3
Gender	Male	54	11	0.021	5	0.021	36(66.7)	0.113
	female	38	39		25		31(81.6)
Age (y)	<60	56	30	0.997	11	0.775	39(69.6)	0.392
	≥60	36	20		8		28(77.8)
Underlying disease	Yes	51	16	0.087	6	0.075	36(70.6)	0.590
	No	41	40		22		31(75.6)
Lesion site	Spine	78	19	0.140	7	0.059	56(71.8)	0.751
	Joint	14	50		60		11(78.6)
Abscess	Yes	29	38	0.439	22	0.339	29(78.4)	0.424
	No	42	16		7		39(70.9)
Number of vertebral segments	≤2	64	13	0.045	6	0.047	43(67.2)	0.016
	>2	14	34		23		14(100)
Previous TB infection history	Yes	12	43	0.557	10	0.775	9(75.0)	1.000
	No	80	20		10		58(72.5)