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Table 2 Characteristics of the trials

From: What influences recruitment to randomised controlled trials? A review of trials funded by two UK funding agencies

Characteristic N n (%)
Design: 122  
   Parallel   113 (93)
   Factorial   6 (5)
   Partially randomised patient preference   3 (2)
Number of arms: 122  
   Two   94 (77)
   Three   18 (15)
   More than three   10 (8)
Clinical areas: 122  
   Cancer   25 (20)
   Mental health (including neurosciences/psychiatry/psychology)   21 (17)
   Orthopaedics/rheumatology (including back pain)   21 (17)
   Obstetrics & Gynaecology   9 (7)
   Primary care   8 (7)
   Cardiology   5 (4)
   Gastroenterology   5 (4)
   Incontinence/urology   5 (4)
   HIV/AIDS   5 (4)
   Other   18 (15)
Setting: 122  
   Hospital   64 (53)
   General practice   26 (21)
   Mixed   16 (13)
   Community   7 (6)
   Missing   9 (7)
Geographical spread: 122  
   Multiple regions   63 (52)
   Regional   51 (42)
   Missing   8 (7)
Any recruiting centres outside UK : 114  
   No   88 (77)
   Yes   25 (22)
   Missing   1 (1)
Interventions: 122  
   Medical (drugs, injections) excluding chemotherapy   37 (30)
   Behavioural therapies (eg CBT with or without conventional drugs)   12 (10)
   Different types of surgical intervention (including laparoscopic)   12 (10)
   Chemotherapy   10 (8)
   New services/treatment policy/information provision (eg support programmes)   9 (7)
   Radiology (including ultrasound)   8 (7)
   Medical instruments (eg metal stents, pacemakers, bandage types)   7 (6)
   Surgery v alternative (eg conservative management, radiotherapy)   4 (3)
   Alternative therapies (including complementary medicine, water-based therapies)   4 (3)
   Other   19 (16)