Comprehensive review of statistical methods for analysing patient-reported outcomes (PROs) used as primary outcomes in randomised controlled trials (RCTs) published by the UK's <i>Health Technology Assessment</i> (HTA) journal (1997-2020).

BMJ Open · 2021 · PMC8422492 · PMID 34489292

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an increasing trendno p-value reported

In recent years, there is an increasing trend of using complex models (eg, with mixed effects).

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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.