Evaluation of an in vitro model with a novel statistical approach to measure differences in bacterial survival of extended-spectrum β-lactamase-producing Escherichia coli on an inanimate surface

Table 1 Survival probabilities per hour (for time period t < 7 h) and per day (for time period t > 7 h) for E. coli ST10 and ST131 per suspension fluid. The survival probability ratio indicates the relative difference in survival between ST131 versus ST10

	t < 7 h			t > 7 h
	Proportion surviving per hour (% [95% CI])		Survival probability ratio [95% CI]	Proportion surviving per day (% [95% CI])		Survival probability ratio [95% CI]
	ST10	ST131	Survival probability ratio [95% CI]	ST10	ST131	Survival probability ratio [95% CI]
Water	25.6 [23.6–27.7]	29.1 [26.9–31.5]	1.14 [1.05–1.23]	90.2 [88.2–92.3]	89.0 [87.0–90.9]	0.99 [0.97–1.00]
Saline	34.6 [32.0–37.3]	39.3 [36.4–42.5]		92.2 [90.5–94.0]	91.0 [89.3–92.7]
Blood	85.1 [78.8–91.9]	96.8 [89.6–104.5]		87.5 [85.8–89.1]	86.3 [84.6–87.9]

ISSN: 2047-2994