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. Author manuscript; available in PMC: 2010 May 1.
Published in final edited form as: J Hosp Infect. 2009 Mar 17;72(1):57–64. doi: 10.1016/j.jhin.2009.01.016

Figure 1.

Figure 1

Observed probability of no tuberculin skin test (TST) conversion in hospital employees by study period (dashed line: 1998–2001; solid line: 2002–2003). Difference between periods: P = 0.022.