Temporal trends in adolescents' self-reported psychosomatic health complaints from 1980-2016: A systematic review and meta-analysis.

PLoS One · 2017 · PMC5705135 · PMID 29182644

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a decreasing trendno p-value reported

In the descriptive analysis, 10 studies indicated a trend of increasing PSHC, eight showed a stable trend and three showed a decreasing trend at certain points in time.

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clearly significantno p-value reported

Northern Europe was the only region to show a clearly significant minor increasing trend, without being the region with the highest total prevalence of PSHC at the present time.

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an increasing trendno p-value reported

Some studies indicate that increasing PSHC are found in girls, but not to the same extent in boys, over time [ 37 , 38 , 40 , 47 , 48 ], while Henriksen [ 41 ] found the opposite, that is, that boys have an increasing trend of PSHC compared to girls.

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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.