Additional File 1.

Length of stay group and readmission free Kaplan-Meier curves (0–28 days). This file demonstrates that during follow-up of 0–28 days, length of stay is not proportional to readmission risk, reason for which a time varying co-variate was included in the Cox regression model (see main article Text).

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Lyratzopoulos et al. BMC Emergency Medicine 2005 5:1   doi:10.1186/1471-227X-5-1