Study designs of evaluations included in the review
Experimental and observational study designs were included in the review. Only two trials included more than 30 participants per treatment group.
Specific interventions included in the review
Studies evaluating any psychological or psychosocial intervention were eligible for inclusion. All of the included studies featured some form of behavioural intervention, most incorporating some form of education. Many of the included interventions were multifaceted.
Participants included in the review
Studies of haemodialysis patients attending renal out-patient settings were eligible for inclusion. One study included only paediatric patients, one only included patients with a history of non-compliance, one focused on long-term haemodialysis patients, and one included only patients with end-stage renal disease.
Outcomes assessed in the review
Studies assessing changes in IWG were eligible for inclusion. The included studies used differing definitions of problematic weight gain varying between 0.9 and 3 kg. Eligible studies reported a number of other secondary outcomes: blood-pressure, health beliefs, potassium level, stages of change, knowledge, blood urea nitrogen level and self-efficacy.
How were decisions on the relevance of primary studies made?
The authors did not state how the papers were selected for review, or how many reviewers performed the selection.