a clear trendp=0.052
In univariable Cox regression analyses, there was a clear trend between higher CFS scores and need for mechanical ventilation during follow-up (HR 1.361, 95% CI 0.998 to 1.857, p=0.052; C-index 0.722), while there was a significant association between lower CFS scores and earlier discharge from hospital (HR 0.531, 95% CI 0.354 to 0.797, p=0.002; C-index 0.742).