Table 2 Purposive subsampling criteria
From: Developing Effective and Efficient care pathways in chronic Pain: DEEP study protocol
Stratification | Details |
|---|---|
Gender | Attempt to gain a 1:1 ratio of gender in subsample |
Care environment | Attempt to gain a 1:1 ratio of those in primary care at baseline and those in secondary care at baseline |
Time in care | Attempt to gain a subsample that contains three broad groups: |
First experience of COFP (maximum 6–12 month history) | |
Moderate experience of COFP (13–23 month history) | |
Long experience of COFP (>23 month history) | |
Origin of COFP | Attempt to get an equal representation of musculoskeletal and neuropathic/vascular origins in sample |