Targeted Screening for Latent TB Infection prior to Biologic Therapy to Improve Patient Safety and Reduce Costs: A Prospective Observational Study

Table 3

Table showing number of patients with positive T-SPOTs according to patient risk factors.

Risk factors	Number of patients	Positive	Negative
None	99	2	97
Hx of TB contact	21	3	18
Ethnicity	6	0	6
Abnormal chest X-ray	4	0	4