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Table 4 Estimates of 6-month change in primary outcomes estimated from proposed model, by period of time and randomization group

From: Evaluation of a risk-stratification strategy to improve primary care for low back pain: the MATCH cluster randomized trial protocol

Period of time

Usual Care (UC) Clinics

Risk Stratification (RS) Clinics

Column Difference

Pre-implementation* of risk stratification (RS)

β0: Change score in UC clinics pre-implementation of RS

β0+ β1: Change score in RS clinics pre-implementation of RS

β1: Difference in change scores due to RS in the pre-implementation period.

Post-implementation of risk stratification (RS)

β0+ β2: Change score in UC clinics post-implementation of RS

β0 + β1 + β2 + β3: Change score in RS clinics post-implementation of RS

β1 + β3: Difference in change scores due to RS in the post-implementation period.

Row Difference

β2: Difference in change scores due solely to time (implementation period).

β2 + β3: Difference in change scores due to time and RS.

β3: Difference in change scores due solely to the RS implementation.

  1. Abbreviations: UC, usual care, RS, risk stratification
  2. *Clinics randomized to implement the risk stratification intervention will do so only in the latter of the two time periods