Bias (Epidemiology) 2 Biometry 2 Critical Illness 2 Data Interpretation, Statistical 2 Humans 2 Mortality 2 Outcome Assessment (Health Care) 2 Patient Dropouts 2 Proportional Hazards Models 2 Questionnaires 2 Risk Assessment 2 Risk Factors 2 Sample Size 2 Survival Analysis 2 Survival Rate 2 daily life activity 2 data collection method human 2 mortality 2 note 2 sensitivity analysis 2 statistical analysis 2