Table 4

Evaluation of the cluster randomised trials (n = 35).

Influences on control caregiversInfluences on control patients
StudyInformed about allocationInformed about content of interventionQuestionnaire before or during trialExtra information/training the on subjectRisk of learning effect by treating intervention patientsInformed consent givenInformed about content of interventionProvided with extra informationInformed about allocationQuestionnaires/examinations before or during interventionRisk of contact with intervention patients
Bebb 200750??++??+
Bellon 200851+??+
Cals 200952+??+???+
Cullen 200653+?+??
Davies 200854??++???+
de Groot 200755??+??++
Downs 200656??
Fitzmaurice 200757??+???
Francis 200958+??+??++?
Harmsen 200559+?++?
Hayward 200660??
Hoddinott 200961++?+???+?
Hogg 200862??
Janssen 200963+?++?+
Jellema 200564+?++
Kerse 200865+?+?+???+
Lester 200766++++
Lester 200967???????+
Lo Fo Wong 200668+?++??
MacArthur 200969????
McNulty 200870
McNulty 200871
Middleton 200672??++?+
Midlöv 200573+
Morrel 200974???+???+
Murphy 200975+?+???+
Nijs 200676+?+???+
Qureshi 200777???+??+
Sackley 200978???+???+
Slade 200879+?
Søndergaard 200580??+
van Bruggen 200881+?+???+
van Marwijk 200882+??+???+
Vass 200983+?+???+
Wilkes 200984+?+????
  • + = risk present, – = risk not present, ? = not described in the article.