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Table 5 Attrition rates for the 10 sites before and after the pause

From: How can we successfully recruit depressed people? Lessons learned in recruiting depressed participants to a multi-site trial of a brief depression intervention (the ‘CLASSIC’ trial)

  Total number (%) recruited and randomised 3-month follow-up before protocol change, n (%) 3-month follow-up after protocol change, n (%)
Lewisham 49 (52.1%) 17 (34.7%) 33 (67.3%)
Wandsworth 48 (78.7%) 17 (35.4%) 35 (72.9%)
Merton 38 (66.7%) 12 (31.6%) 33 (86.8%)
Sub-total for three sites 135 46 (34.1%) 101 (74.8%)
After pause and review of procedures
 Croydon 73 (78.5%)   64 (87.7%)
 Lambeth 34 (58.6%)   28 (82.4%)
 Bexley 51 (72.9%)   42 (82.4%)
 Greenwich 49 (57.6%)   39 (79.6%)
 Kingston 45 (60.0%)   42 (93.3%)
 Lewisham 2 34 (54.0%)   30 (88.2%)
 Croydon 2 38 (48.7%)   36 (94.7%)
 Sub-total for seven sites 324   281 (86.7%)
Total 459 (62.5%)   382a (83.2%)
  1. aOne additional person withdrew consent and one additional person provided incomplete follow-up BDI data