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Table 1 Trial characteristics

From: Can we achieve better recruitment by providing better information? Meta-analysis of ‘studies within a trial’ (SWATs) of optimised participant information sheets

Trial name Population Host trial intervention and comparison Design of the host trial Design of SWAT
CASPER [10] Patients at least 65 years of age with sub-threshold depression Intervention: collaborative care including screening for depression, collaborative care and low intensity psychological intervention plus usual GP care
Comparator: usual GP care alone
Individually randomised two-arm parallel group trial Individually randomised two-arm parallel group trial
ECLS [8] Current or ex-smokers aged 50 to 75 years Intervention: A new blood test named EarlyCDT-Lung test to detect seven autoantibodies to aid in the risk assessment and early detection of lung cancer
Comparator: standard care
Individually randomised two-arm parallel group trial Individually randomised two-arm parallel group trial
Healthlines CVD [7] Those aged 40 to 74 years with increased risk of cardiovascular disease Intervention: NHS Direct-delivered telehealth intervention including telephone support and computer-based self-management to support patients
Comparator: usual care
Individually randomised two-arm parallel group trial Individually randomised two-arm parallel group trial
Healthlines Depression [7] Those at least 18 years of age and having a confirmed diagnosis of clinical depression Intervention: NHS Direct-delivered telehealth intervention including telephone support and computer-based self-management to support patients
Comparator: usual care
Individually randomised two-arm parallel group trial Individually randomised two-arm parallel group trial
HeLP Diabetes [unpublished] Adults aged 18 or over, with type 2 diabetes Intervention: facilitated and supported access (1—an introductory session with nurse introducing HeLP Diabetes web-based programme, 2—supportive follow-up phone calls, and 3—on-going discussion of patient’s self-management goals in routine appointments for diabetes-related matters) to healthcare for patients with diabetes)
Comparator: an introductory session with nurse and follow-up phone calls
Individually randomised two-arm parallel group trial Two-arm randomised trial, clustered by general practice
ISDR [9] People with diabetes undergoing annual screening for diabetic retinopathy Intervention: personalised risk based screening intervals
Comparator: annual screening
Individually randomised two-arm parallel group trial Two-arm randomised trial, clustered by week of recruitment
REFORM [6] Podiatry patients over the age of 65 years Intervention: multifaceted foot and lower limb intervention for prevention of falls
Comparator: a leaflet with fall prevention advice plus continue with current podiatry treatment
Two-arm open randomised cohort controlled trial Individually randomised three-arm cohort trial