estimates for TW and non-TW combined.

Phase-specific estimates for the daily probability of a susceptible patient acquiring MRSA from an MRSA positive patient in the same ward, for ICU 1 and ICU 2 (without distinguishing between TW and non-TW strains). In the Combined row, the estimates are constrained to be the same in both wards, and the All phases column constrains the estimates to be the same in the four phases.1P-values test the null hypothesis that transmission does not vary between study phase (likelihood ratio test, df = 3).2P-values test the null hypothesis that transmission in the current phase does not differ between wards (likelihood ratio test, df = 1).