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. 2016 Oct 11;8(10):624. doi: 10.3390/nu8100624

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Dose–response function and marginal treatment effect function (dP/dVA) of expected probability of PLC and vitamin A intake (in μg retinol equivalent (RE)/day, 1 μg RE = 3.3 IU) using the generalized propensity score (GPS) approach, point estimate, and 95% CI. (A) The relationship between VA intake and the expected probability of PLC; (B) marginal treatment effect function of VA intake and the expected probability of PLC association. Lower and upper bound: 95% confidence interval; P (PLC) = the expected probability of PLC; dP/dVA = the derivating dose–response function.