From: A systematic review of psychosocial interventions for family carers of palliative care patients
Grade I (Strong evidence) |
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RCTs or review of RCTS |
IA Calculation of sample size and accurate standard definition of appropriate outcome variables |
IB Accurate and standard definition of appropriate outcome variables |
IC Neither of the above |
Grade II (Fairly strong evidence) |
Prospective study with a comparison group (non-randomised controlled trial, good observational study or retrospective study that controls effectively for confounding variables). |
IIA Calculation of sample size and accurate, standard definition of appropriate outcome variables and adjustment for the effects of important confounding variables |
IIB One or more of the above |
Grade III (Weaker evidence) |
Retrospective or observational studies |
IIIA Comparison group, calculation of sample size, accurate and standard definition of appropriate outcome variables |
IIIB Two or more of the above |
IIIC None of these |
Grade IV (Weak evidence) |
Cross-sectional study, Delphi exercise, consensus of experts |