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Table 3 Recruitment in trials

From: A reinvestigation of recruitment to randomised, controlled, multicenter trials: a review of trials funded by two UK funding agencies

  1994 to 2002 2002 to 2008
Total Total P value With CTU Without CTU P value
  N n (%) N n (%) N n (%) N n (%)  
Was recruitment a success? 122   73   0.002a 31   40   0.235a
Yes   38 (31)   40 (55)   20 (65)   19 (48)
No   84 (69)   33 (45)   11 (36)   21 (53)
Was the recruitment target revised? 122   73   0.036a 31   40   0.1183a
Yes   42 (34)   14 (19)   3 (10)   11 (28)
No   76 (62)   56 (77)   27 (87)   28 (70)
Missing   4 (3)   3 (4)   1 (3)   1 (3)
Final recruitment figure           
Original target: 122   73   <0.001b 31   40   <0.001b
≥100%   38 (31)   40 (55)   20 (65)   19 (48)
≥80% but <100%   29 (24)   17 (23)   8 (26)   9 (23)
<80%   55 (45)   16 (22)   3 (10)   12 (30)
Revised target: 42   14   0.021b 3   11   N/Ab
≥100%   19 (45)   10 (71)   2 (67)   8 (73)
≥80% but <100%   15 (36)   3 (21)   0 (0)   3 (27)
<80%   8 (19)   1 (7)    1 (33)   0 (0)  
  1. a P values calculated using χ 2 tests, excluding missing categories.
  2. b P values calculated using χ 2 tests for trend; in the final case counts were too small to perform tests.
  3. CTU, clinical trials unit; N/A, not applicable.