Retrospective analysis of linear accelerator output constancy checks using process control techniques.

J Appl Clin Med Phys · 2013 · PMC5713921 · PMID 23318390

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a clear trendno p-value reported

There is a clear trend that by month two or three (8 to 12 data points), the limits are stable.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.