There is strong evidence that the processes used by rehabilitation services are effective at reducing mortality and morbidity, yet purchasers still feel that there is insufficient evidence to warrant buying rehabilitation. Why? Evidence in support of many individual treatments is either weak or absent, but it is important not to conflate evidence about the process with evidence about specific actions. The absence of evidence concerning specific interventions should not be interpreted as meaning that rehabilitation is ineffective, and should certainly not be used as an excuse not to purchase rehabilitation. The evidence strongly suggests that the whole system works and until we have further evidence, the system should be bought as a whole. Further research into specific interventions should continue, but in addition there should be more research attention paid to the rehabilitation process itself.
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