Socioeconomic differences in self-medication among middle-aged and older people: data from the China health and retirement longitudinal study.

BMJ Open · 2017 · PMC5778336 · PMID 29259056

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a clear trendno p-value reported

There was a clear trend towards more self-medication with OTCs, but not POMs, among those with higher educational attainment.

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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.