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Table 1 Data extraction categories

From: Out-of-hours discharge from intensive care, in-hospital mortality and intensive care readmission rates: a systematic review protocol


Age, sex, surgical status (elective, emergency, none), severity of illness assessment. Availability of high-dependency care within ICU or in discrete unit, ICU type

Assessment of occupancy

Assessment of premature discharge


Proportion discharged ‘in-hours’. Definition of in-hours

Discharge destination (level of subsequent care)

Proportion of discharges deemed ‘premature’


Proportion discharged ‘out-of-hours’. Definition of out-of-hours

Discharge destination (level of subsequent care)

Outcome assessment

Mortality associated with out-of-hours discharge

Data source for mortality

Coding of palliative care patients

Missing data

Readmission rate

Data source for readmission rate associated with out-of-hours discharge

Severity score assessment of in-hours versus out-of-hours groups


Study design, number of sites, authors, publication year, country, duration

Primary endpoint (where stated) or main focus (time of discharge versus factors associated with outcome post-discharge, other)

Quality assessment


Sources of participants

Follow-up time

Completeness of data

Adjustment for potential confounders

Further subjective assessment in relation to heterogeneity of studies

Method of severity of illness assessment

Method of risk adjustment

Risk-adjusted results