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. 2006 Sep 19;7:54. doi: 10.1186/1471-2296-7-54

Table 2.

Reasons for withdrawal from the trials

Reasons for withdrawal No. of patients in series A No. of patients in series B
Perceived lack of efficacy 4 2
Perceived side effects 1 1
Duration of trial period too long 1 -

Series A: NSAIDs or paracetamol for osteoarthritis

Series B: reduction of temazepam for sleep disturbances