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Table 6 Reasons given for not taking part in a trial

From: Is it possible to estimate the minimal clinically important treatment effect needed to change practice in preterm birth prevention? Results of an obstetrician survey used to support the design of a trial

Trial Reasons for not joining  
Vaginal progesterone in
women with multiple
pregnancies
  n = 85
  Small numbers/rural 26 (30.6%)
  Concerns re intervention 11 (12.9%)
  Concerns re trial design 10 (11.8%)
  Retiring soon 9 (10.6%)
  Lack of resources 9 (10.6%)
  Do not do research 6 (7.1%)
  Not recorded 14 (16.5%)
IM progesterone in women
with singleton pregnancies with
risk factors for preterm birth
  n = 119
  Concerns re intervention 32 (26.9%)
  Lack of resources 23 (19.3%)
  Small numbers/rural 18 (15.1%)
  Concerns re trial design 9 (7.6%)
  Retiring soon 9 (7.6%)
  Do not do research 4 (3.4%)
  Sufficient evidence 2 (1.7%)
  Not recorded 22 (18.5%)
Cerclage in women with risk
factors for preterm birth
  n = 288
  Concerns re intervention 110 (38.2%)
  Sufficient evidence 38 (13.2%)
  Do not do cerclage 32 (11.1%)
  Concerns re trial design 28 (9.7%)
  Small numbers/rural 21 (7.3%)
  Lack of resources 10 (3.5%)
  Retiring soon 8 (2.8%)
  Do not do research 4 (1.4%)
  Not recorded 37 (12.8%)