Table 2

Requirements for Paired Availablity Design

Requirement

Specific Criteria


Stable population

1.

Hospital serves one geographic area or

is military medical center

2.

No in- or out- migration

3.

Eligibility criteria constant over time

4.

No underlying change in prognosis

over time


Stable treatment

1.

Other patient management constant

over time


Stable evaluation

1.

Evaluation criteria constant over time


Stable preference

1.

No publicized credible reports

2.

No direct-to-consumer advertising


Effect of the intervention on outcome does

1.

Effect of intervention does not depend

not change with a change in availability

on when the intervention was given

(only applicable when some in "before"

during the course of disease

group receive intervention)

2.

No learning curve for the intervention



Baker et al. BMC Medical Research Methodology 2001 1:9   doi:10.1186/1471-2288-1-9

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