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Table 2 The TB infection rate in different period was compared by SPSS software. The period from 2006 to 2018 could be divided into early TB-IPC (2006–2010) and enhanced TB-IPC (2015–2018) according to the change of TB-IPC measure. The early TB-IPC (2006–2010) was set for reference group

From: Nosocomial tuberculosis transmission from 2006 to 2018 in Beijing Chest Hospital, China

  The average TB incidence rate per year in TB exposed environment (‰) P value
Early TB-IPC (2006–2010) 32.1  
Intermediate TB-IPC (2011–2014) 24.4 0.350
Enhanced TB-IPC (2015–2018) 11.3 0.002