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Studies seven pressure relieving mattress overlays for the prevention of pressure sores in elderly patients. Seven mattress overlays; Patients with Ripple beds showing deterioration of the pressure areas; Patients with fiber fills and deteriorated pressure areas; Patients with water mattresses and deteriorated pressure areas; Patients with contoured foam.

Compares the effectiveness and cost of alternating pressure (AP) and constant low pressure (CLP) supports for pressure sore prevention in hospitals. Mean ages; Norton scores; Sex; Mean days in the trial; Percentage of deaths; Number of sores developed by patients with AP and CLP supports; Mattress changes required for both groups.