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Table 1

Return to:   Estimating the Risk of Chronic Pain: Development and Validation of a
Prognostic Model (PICKUP) for Patients with Acute Low Back Pain

Key differences in the development and external validation studies.
CharacteristicDevelopment SampleExternal Validation Sample
DesignCohort studyRandomized trial
Recruitment period2003–20052009–2013
Number of participants by recruitment setting
Physiotherapy774
General practice73181
Pharmacy050
Chiropractic200
LocationSydney metropolitan areaGreater Sydney area
Inclusion/exclusion criteria
RadiculopathyExcludedIncluded
Moderate intensity painNot consideredIncluded
Use of regular analgesicsIncludedExcluded
TreatmentAdvice plus usual careAdvice plus paracetamol or placebo