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. 2017 Oct 10;61(1):93–100. doi: 10.1007/s00125-017-4452-7

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Curves of ORs (95% CI) derived from logistic regression models including restricted cubic splines to evaluate the associations of incident type 2 diabetes with (a) FPG (b) 2hPG (c) HbA_1c (d) log_e fasting insulin and (e) log_e HOMA-IR. The dots (95% CI) are the ORs after each risk factor is converted into quintiles with the first dot indicating the lowest quintile, which is used as reference category. Adjustment was made for age, sex, and follow-up duration. The vertical dotted lines indicate the knot locations (percentile 10, 50, 90)