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Table 1 Characteristics of studies evaluating isolated effects of an AP as an addition to care as usual.

From: Action Plan to enhance self-management and early detection of exacerbations in COPD patients; a multicenter RCT

  Current study Watson Wood-Baker McGeoch
Procedure     
Recruitment OC + GP GP GP GP
Pilot-study + + - +
Intervention     
- Early contact + + + +
- Self-initiation drugs - + + +
- Reinforcement + - - -
Outcome exa-rt SGRQ SGRQ SGRQ
Validity     
Randomization individual individual clustered clustered
Blinding pt + inv - - -
Stratification by centre - - -
Statistics     
Follow-up (mths) 6 6 12 12
n   56 102 151
Powered on Δ exa-rt = 1 Δ SGRQ = 5.7 Δ SGRQ = 4 Δ SGRQ = 4
SSC 245 124 124 160
  1. OC, outpatient clinic; GP, general practice; exa-rt, exacerbation recovery time; SGRQ, St George respiratory questionnaire n, number of patients; SSC, sample size calculation; pt, patient; inv, investigator.