Validation of survey effort measures of grit and self-control in a sample of high school students.

PLoS One · 2020 · PMC7329102 · PMID 32609785

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marginally significantno p-value reported

Finally, generally none of the survey effort measures was found to be a predictor of high school graduation, only dichotomous item non-response appears marginally significant when included along with item non-response rates.

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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.