. Author manuscript; available in PMC: 2017 May 1.

Published in final edited form as: Am J Infect Control. 2016 Jan 14;44(5):507–514. doi: 10.1016/j.ajic.2015.10.042

Appendix Table 2.

Counts of the observed transitions and transition probabilities (parenthetically) for all facilities combined for the three-state model and strain-specific two-state models.

From State	To State
From State	Negative	USA300	non-USA300
Three-State Model^*
Negative	711 (0.913)	13 (0.017)	55 (0.071)
USA300	10 (0.222)	30 (0.667)	5 (0.111)
non-USA300	52 (0.278)	2 (0.011)	132 (0.711)
Two-State Strain-Specific Models
USA 300 Model^†
Negative	950 (0.984)	15 (0.016)	NA
USA300	15 (0.333)	30 (0.667)	NA
Non-USA300 Model^‡
Negative	762 (0.929)	NA	58 (0.071)
non-USA300	54 (0.284)	NA	136 (0.716)

In the three-state model, subjects can be MRSA-free (Negative), colonized with USA300 and possibly co-colonized with non-USA300 (USA300) or colonized with non-USA300 only (non-USA300).

^†

In this model, a subject can be either colonized with USA300 (USA300) or non-colonized with USA (Negative). Subjects classified as Negative in this model can be colonized with non-USA300 strains.

^‡

In this model, a subject can be either colonized with non-USA300 (non-USA300) or free from non-USA300 (Negative). Subjects classified as Negative in this model can be colonized with USA300.