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Table 1 Call time distribution

From: Health services changes: is a run-in period necessary before evaluation in randomised clinical trials?

  Mean (SD), number of telephone calls
  Run-in period N = 759 Main trial N = 1236
PCT   
  A 31 (12.2), 190 23 (9.3), 395
  B 29 (11.1), 181 27 (9.8), 290
  C 38 (12.7), 255 30 (15.5), 298
  D 23 (7.3), 133 19 (7.5), 253