Assessing the role of undetected colonization and isolation precautions in reducing Methicillin-Resistant Staphylococcus aureustransmission in intensive care units

Table 4 Assessment of isolation efficacy

Ward	Full model		No-background		Non-linear
	P(β ₁ > β ₂)	Median (β ₁/β ₂)	P(β ₁ > β ₂)	Median (β ₁/β ₂)	P(β ₁ > β ₂)	Median (β ₁/β ₂)
M1	0.82	2.7	0.83	2.4	0.75	2.3
M2	0.51	1.0	0.54	1.1	0.45	0.8
GS1	0.27	0.5	0.15	0.3	0.36	0.6
GS2	0.50	1.0	0.58	1.2	0.62	1.5
SS1	0.73	2.7	0.57	1.3	0.53	1.1
SS2	0.79	3.3	0.79	2.0	0.71	2.0
SS3	0.44	0.8	0.60	1.3	0.67	2.0
SS4	0.58	1.3	0.70	2.3	0.59	1.4

Note. P(β ₁ > β ₂), the probability that β ₁ is larger than β ₂, measures the strength of the evidence that isolation was associated with reduced transmission (a value of 1 would indicate certainty), and the ratio of β ₁ to β ₂ measures the relative infectivity of unisolated compared to unisolated patients.

ISSN: 1471-2334